continents - Vocabulary List : Vocabulary.com continents August 9, 2011 By Jean F. Rate this list: landmass a large continuous extent of land Many of the seven most commonly recognized continents identified by convention are not discrete landmasses separated by water. a large continuous extent of land [edit] Definitions and application Dymaxion maps shows land masses with minimal distortion Conventionally, "continents are understood to be large, continuous, discrete masses of land, ideally separated by expanses of water."[3] one of the large landmasses of the earth [edit] Definitions and application Dymaxion maps shows land masses with minimal distortion Conventionally, " continents are understood to be large, continuous, discrete masses of land, ideally separated by expanses of water."[3] Oceania a large group of islands in the south Pacific including Melanesia and Micronesia and Polynesia (and sometimes Australasia and the Malay Archipelago) Extrapolating the concept to its extreme, some geographers group the Australasian continental plate with other islands in the pacific into one continent called Oceania.

New Guinea a Pacific island to the north of Australia In this sense the term continental Europe is used to refer to mainland Europe, excluding islands such as Great Britain, Ireland, and Iceland, and the term continent of Australia may refer to the mainland of Australia, excluding Tasmania and New Guinea< Tasmania an island off the southeastern coast of Australia In this sense the term continental Europe is used to refer to mainland Europe, excluding islands such as Great Britain, Ireland, and Iceland, and the term continent of Australia may refer to the mainland of Australia, excluding Tasmania and New Guinea. Guinea a republic in western Africa on the Atlantic In this sense the term continental Europe is used to refer to mainland Europe, excluding islands such as Great Britain, Ireland, and Iceland, and the term continent of Australia may refer to the mainland of Australia, excluding Tasmania and New Guinea.

mainland the main land mass of a country or continent The Earth's major landmasses are washed upon by a single, continuous world ocean, which is divided into a number of principal oceanic components by the continents and various geographic criteria.[4][5] [edit] Extent of continents The narrowest meaning of continent is that of a continuous[6] area of land or mainland, with the coastline and any land boundaries forming the edge of the continent. Iceland a volcanic island in the North Atlantic near the Arctic Circle In this sense the term continental Europe is used to refer to mainland Europe, excluding islands such as Great Britain, Ireland, and Iceland, and the term continent of Australia may refer to the mainland of Australia, excluding Tasmania and New Guinea. Pacific Ocean the largest ocean in the world Similarly, the continental United States refers to the 48 contiguous states in central North America and may include Alaska in the northwest of the continent (the two being separated by Canada), while excluding Hawaii in the middle of the Pacific Ocean. a republic on the island of Madagascar In this way, Iceland is considered part of Europe and Madagascar part of Africa.

Australia the smallest continent The criterion "large" leads to arbitrary classification: Greenland, with a surface area of 2,166,086 square kilometres (836,330 sq mi) is considered the world's largest island, while Australia, at 7,617,930 square kilometres (2,941,300 sq mi) is deemed to be a continent. Greenland the largest island in the world The criterion "large" leads to arbitrary classification: Greenland, with a surface area of 2,166,086 square kilometres (836,330 sq mi) is considered the world's largest island, while Australia, at 7,617,930 square kilometres (2,941,300 sq mi) is deemed to be a continent.

island a land mass that is surrounded by water The criterion "large" leads to arbitrary classification: Greenland, with a surface area of 2,166,086 square kilometres (836,330 sq mi) is considered the world's largest island, while Australia, at 7,617,930 square kilometres (2,941,300 sq mi) is deemed to be a continent. Hawaii a state in the United States in the central Pacific on the Hawaiian Islands Similarly, the continental United States refers to the 48 contiguous states in central North America and may include Alaska in the northwest of the continent (the two being separated by Canada), while excluding Hawaii in the middle of the Pacific Ocean. Great Britain a monarchy in northwestern Europe occupying most of the British Isles; divided into England and Scotland and Wales and Northern Ireland; `Great Britain' is often used loosely to refer to the United Kingdom In this sense the term continental Europe is used to refer to mainland Europe, excluding islands such as Great Britain, Ireland, and Iceland, and the term continent of Australia may refer to the mainland of Australia, excluding Tasmania and New Guinea.

Europe the 2nd smallest continent Likewise, the ideal criterion that each be a continuous landmass is often disregarded by the inclusion of the continental shelf and oceanic islands, and contradicted by classifying North and South America as one continent; and/or Asia, Europe and Africa as one continent, with no natural separation by water. the solid part of the earth's surface [edit] Definitions and application Dymaxion maps shows land masses with minimal distortion Conventionally, "continents are understood to be large, continuous, discrete masses of land, ideally separated by expanses of water."[3] Alaska a state in northwestern North America Similarly, the continental United States refers to the 48 contiguous states in central North America and may include Alaska in the northwest of the continent (the two being separated by Canada), while excluding Hawaii in the middle of the Pacific Ocean. South America a continent in the western hemisphere connected to North America by the Isthmus of Panama Likewise, the ideal criterion that each be a continuous landmass is often disregarded by the inclusion of the continental shelf and oceanic islands, and contradicted by classifying North and South America as one continent; and/or Asia, Europe and Africa as one continent, with no natural separation by water.

North America a continent (the third largest) in the western hemisphere connected to South America by the Isthmus of Panama Similarly, the continental United States refers to the 48 contiguous states in central North America and may include Alaska in the northwest of the continent (the two being separated by Canada), while excluding Hawaii in the middle of the Pacific Ocean. Asia the largest continent with 60% of the earth's population Likewise, the ideal criterion that each be a continuous landmass is often disregarded by the inclusion of the continental shelf and oceanic islands, and contradicted by classifying North and South America as one continent; and/or Asia, Europe and Africa as one continent, with no natural separation by water.

shallow lacking physical depth From the perspective of geology or physical geography, continent may be extended beyond the confines of continuous dry land to include the shallow, submerged adjacent area (the continental shelf)[7] and the islands on the shelf (continental islands), as they are structurally part of the continent.[8] Ireland an island comprising the republic of Ireland and Northern Ireland In this sense the term continental Europe is used to refer to mainland Europe, excluding islands such as Great Britain, Ireland, and Iceland, and the term continent of Australia may refer to the mainland of Australia, excluding Tasmania and New Guinea. Pacific relating to or bordering the Pacific Ocean Similarly, the continental United States refers to the 48 contiguous states in central North America and may include Alaska in the northwest of the continent (the two being separated by Canada), while excluding Hawaii in the middle of the Pacific Ocean. Africa the second largest continent Likewise, the ideal criterion that each be a continuous landmass is often disregarded by the inclusion of the continental shelf and oceanic islands, and contradicted by classifying North and South America as one continent; and/or Asia, Europe and Africa as one continent, with no natural separation by water.

ocean a large body of water that is part of the hydrosphere The Earth's major landmasses are washed upon by a single, continuous world ocean, which is divided into a number of principal oceanic components by the continents and various geographic criteria.[4][5] [edit] Extent of continents The narrowest meaning of continent is that of a continuous[6] area of land or mainland, with the coastline and any land boundaries forming the edge of the continent. Britain a monarchy in northwestern Europe occupying most of the British Isles; divided into England and Scotland and Wales and Northern Ireland; `Great Britain' is often used loosely to refer to the United Kingdom In this sense the term continental Europe is used to refer to mainland Europe, excluding islands such as Great Britain, Ireland, and Iceland, and the term continent of Australia may refer to the mainland of Australia, excluding Tasmania and New Guinea.

North the region of the United States lying to the north of the Mason-Dixon line Likewise, the ideal criterion that each be a continuous landmass is often disregarded by the inclusion of the continental shelf and oceanic islands, and contradicted by classifying North and South America as one continent; and/or Asia, Europe and Africa as one continent, with no natural separation by water. Canada a nation in northern North America Similarly, the continental United States refers to the 48 contiguous states in central North America and may include Alaska in the northwest of the continent (the two being separated by Canada), while excluding Hawaii in the middle of the Pacific Ocean. America North America and South America and Central America Likewise, the ideal criterion that each be a continuous landmass is often disregarded by the inclusion of the continental shelf and oceanic islands, and contradicted by classifying North and South America as one continent; and/or Asia, Europe and Africa as one continent, with no natural separation by water.

narrow not wide The Earth's major landmasses are washed upon by a single, continuous world ocean, which is divided into a number of principal oceanic components by the continents and various geographic criteria.[4][5] [edit] Extent of continents The narrowest meaning of continent is that of a continuous[6] area of land or mainland, with the coastline and any land boundaries forming the edge of the continent. United States North American republic containing 50 states - 48 conterminous states in North America plus Alaska in northwest North America and the Hawaiian Islands in the Pacific Ocean; achieved independence in 1776 Similarly, the continental United States refers to the 48 contiguous states in central North America and may include Alaska in the northwest of the continent (the two being separated by Canada), while excluding Hawaii in the middle of the Pacific Ocean. state the way something is with respect to its main attributes Similarly, the continental United States refers to the 48 contiguous states in central North America and may include Alaska in the northwest of the continent (the two being separated by Canada), while excluding Hawaii in the middle of the Pacific Ocean. continent - National Geographic Society continent This map beautifully illustrates the continent of Australia.

Map by Sean O'Connor Microcontinents In addition to the seven major continents, Earth is home to microcontinents, or pieces of land that are not geologically identified with a continent. Major microcontinents include: Zealandia, in the South Pacific Ocean, whose land includes New Zealand and New Caledonia Madagascar, in the South Indian Ocean the Mascarene Plateau, in the South Indian Ocean, whose lands include the Seychelles and Reunion islands the Kerguelen Plateau, in the South Indian Ocean, whose lands include the Kerguelen Islands, a territory of France Jan Mayen, in the North Atlantic Ocean, a Norwegian island A continent is one of Earth’s seven main divisions of land. The continents are, from largest to smallest: Asia, Africa, North America, South America, Antarctica, Europe, and Australia. When geographer s identify a continent, they usually include all the island s associated with it. Japan, for instance, is part of the continent of Asia. Greenland and all the islands in the Caribbean Sea are usually considered part of North America. Together, the continents add up to about 148 million square kilometers (57 million square miles) of land.

Continents make up most—but not all—of the Earth’s land surface. A very small portion of the total land area is made up of islands that are not considered physical parts of continents. New Zealand, French Polynesia, and the Hawaiian Islands are examples of land areas that are considered microcontinent s. These areas are usually grouped with culturally similar continents, but are geologic ally distinct . The ocean , divided into four major bodies of water, covers almost three-fourths of the Earth. The area of the ocean is more than double the area of all the continents combined. All continents border at least two oceans. Asia, the largest continent, has the longest series of coastline s.< Coastlines, however, do not indicate the actual boundaries of the continents. Continents are defined by their continental shelves. A continental shelf is a gently sloping area that extends outward from the beach far into the ocean. A continental shelf is part of the ocean, but also part of the continent. If continental shelves were included in the total land area, continents would make up more than one-third of the Earth’s surface. “Continent” has more than just a physical definition. To human geographers, the term is about culture .

The continents of Europe and Asia, for example, are actually part of a single, enormous piece of land called Eurasia. But linguistic ally and ethnically, the areas of Asia and Europe are distinct. The various cultural groups of Europe have more in common with one another than they do with cultural groups in Asia. Because of this, most geographers divide Eurasia into Europe and Asia. An imaginary line, running from the northern Ural Mountains in Russia south to the Caspian and Black Seas, separates Europe, to the west, from Asia, to the east. Building the Continents The Earth formed 4.6 billion years ago from a great, swirling cloud of dust and gas . The continuous smashing of space debris and the pull of gravity made the inside of the Earth heat up. As the heat increased, some of the Earth’s rocky materials melted and rose to the surface, where they cooled and formed a crust. Heavier material sank toward the Earth’s center. Eventually, the Earth came to have three main layers: the core , the mantle , and the crust . The crust and the top portion of the mantle form a rigid shell around the Earth that is broken up into huge sections called tectonic plate s.

The heat from inside the Earth causes the plates to slide around on the molten mantle. Today, tectonic plates continue to slowly slide around the surface, just as they have been doing for hundreds of millions of years. Geologist s believe the interaction of the plates, a process called plate tectonics , contributed to the creation of continents. Studies of rocks found in ancient areas of North America have revealed that the oldest known pieces of the continents began to form nearly 4 billion years ago, soon after the Earth itself formed. At that time, a primitive ocean covered Earth. Only a small fraction of the crust was made up of continental material. Scientists theorize that this material built up along the boundaries of tectonic plates during a process called subduction . During subduction, plates collide, and the edge of one plate slides beneath the edge of another. When heavy oceanic crust subduct ed toward the mantle, it melted in the mantle’s intense heat. Once melted, the rock became lighter. Called magma , it rose through the overlying plate and burst out as lava . When the lava cooled, it hardened into igneous rock . Gradually, the igneous rock built up into small volcanic island s above the surface of the ocean.

Over time, these islands grew bigger, partly as the result of more lava flows and partly from the buildup of material scraped off descending plates. When plates carrying islands subducted, the islands themselves did not descend into the mantle. Their material fuse d with that of islands on the neighboring plate. This made even larger landmasses—the first continents. The building of volcanic islands and continental material through plate tectonics is a process that continues today. Continental crust is much lighter than oceanic crust. In subduction zone s, where tectonic plates interact with each other, oceanic crust always subducts beneath continental crust. Oceanic crust is constantly being recycled in the mantle. For this reason, continental crust is much, much older than oceanic crust. Wandering Continents If you could visit the Earth as it was millions of years ago, it would look very different. The continents have not always been where they are today. About 480 million years ago, most continents were scattered chunks of land lying along or below the Equator . Millions of years of continuous tectonic activity changed their positions, and by 240 million years ago, almost all of the world’s land was joined in a single, huge continent.

Geologists call this supercontinent Pangaea , which means “all lands” in Greek. By about 200 million years ago, the forces that helped form Pangaea caused the supercontinent to begin to break apart. The pieces of Pangaea that began to move apart were the beginnings of the continents that we know today. A giant landmass that would become Europe, Asia, and North America separated from another mass that would split up into other continents. In time, Antarctica and Australia, still joined together, broke away and drifted south. The small piece of land that would become the peninsula of India broke away and for millions of years moved north as a large island. It eventually collided with Asia. Gradually, the different landmasses moved to their present locations. The positions of the continents are always changing. North America and Europe are moving away from each other at the rate of about 2.5 centimeters (1 inch) per year. If you could visit the planet in the future, you might find that part of the U.S. state of California had separated from North America and become an island. Africa might have split in two along the Great Rift Valley. It is even possible that another supercontinent may form some day.

Continental Features The surface of the continents has changed many times because of mountain building, weathering , erosion , and build-up of sediment . Continuous, slow movement of tectonic plates also changes surface features. The rocks that form the continents have been shaped and reshaped many times. Great mountain range s have risen and then have been worn away. Ocean waters have flood ed huge areas and then gradually dried up. Massive ice sheet s have come and gone, sculpting the landscape in the process. Today, all continents have great mountain ranges, vast plain s, extensive plateau s, and complex river system s. The landmasses’ average elevation above sea level is about 838 meters (2,750 feet). Although each is unique , all the continents share two basic features: old, geologically stable regions, and younger, somewhat more active region s. In the younger regions, the process of mountain building has happened recently and often continues to happen. The power for mountain building, or orogeny , comes from plate tectonics. One way mountains form is through the collision of two tectonic plates. The impact creates wrinkles in the crust, just as a rug wrinkles when you push against one end of it.

Such a collision created Asia’s Himalaya Mountains several million years ago. The plate carrying India slowly and forcefully shoved the landmass of India into Asia, which was riding on another plate. The collision continues today, causing the Himalayas to grow taller every year. Recently formed mountains, called coastal range s, rise near the western coasts of North and South America. Older, more stable mountain ranges are found in the interior of continents. The Appalachians of North America and the Urals, on the border between Europe and Asia, are older mountain ranges that are not geologically active. Even older than these ancient, eroded mountain ranges are flatter, more stable areas of the continents called craton s. A craton is an area of ancient crust that formed during the Earth’s early history. Every continent has a craton. Microcontinents, like New Zealand, lack cratons. Cratons have two forms: shield s and platform s. Shields are bare rocks that may be the roots or cores of ancient mountain ranges that have completely eroded away. Platforms are cratons with sediment and sedimentary rock lying on top. The Canadian Shield makes up about a quarter of North America.

For hundreds of thousands of years, sheets of ice up to 3.2 kilometers (2 miles) thick coated the Canadian Shield. The moving ice wore away material on top of ancient rock layers, exposing some of the oldest formations on Earth. When you stand on the oldest part of the Canadian Shield, you stand directly on rocks that formed more than 3.5 billion years ago. North America North America, the third-largest continent, extends from the tiny Aleutian Islands in the northwest to the Isthmus of Panama in the south. The continent includes the enormous island of Greenland in the northeast. In the far north, the continent stretches halfway around the world, from Greenland to the Aleutians. But at Panama’s narrowest part, the continent is just 50 kilometers (31 miles) across. Young mountains—including the Rockies, North America’s largest chain—rise in the West. Some of the Earth’s youngest mountains are found in the Cascade Range of the U.S. states of Washington, Oregon, and California. Some peaks there began to form only about a million years ago—a wink of an eye in Earth’s long history. North America’s older mountain ranges rise near the East Coast of the United States and Canada.

In between the mountain systems lie wide plains that contain deep, rich soil . Much of the soil was formed from material deposited during the most recent glacial period . This ice age reached its peak about 18,000 years ago. As glacier s retreated, streams of melted ice dropped sediment on the land, building layers of fertile soil in the plains region. Grain grown in this region, called the “breadbasket of North America,” feeds a large part of the world. North America contains a variety of natural wonders. Landforms and all types of vegetation can be found within its boundaries. North America has deep canyon s, such as Copper Canyon in the Mexican state of Chihuahua. Yellowstone National Park, in the U.S. state of Wyoming, has some of the world’s most active geyser s. Canada’s Bay of Fundy has the greatest variation of tide levels in the world. The Great Lakes form the planet’s largest area of freshwater . In the U.S. state of California, giant sequoia s, the world’s most massive trees, grow more than 76 meters (250 feet) tall and nearly 31 meters (100 feet) around.

Greenland, off the east coast of Canada, is the world’s largest island. Despite its name, Greenland is mostly covered with ice. Its ice is a remnant of the great ice sheets that once blanket ed much of the North American continent. Greenland is the only place besides Antarctica that still has an ice sheet. From the freezing Arctic to the tropical jungle s of Central America, North America enjoys more climate variation than any other continent. Almost every type of ecosystem is represented somewhere on the continent, from coral reef s in the Caribbean to Greenland’s ice sheet to the Great Plains in the U.S. and Canada. Today, North America is home to the citizens of Canada, the United States, Greenland, Mexico, Belize, Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua, Panama, and the island countries and territories that dot the Caribbean Sea and the western North Atlantic Ocean. Most of North America sits on the North American Plate. Parts of the Canadian province of British Columbia and the U.S. states of Washington, Oregon, and California sit on the tiny Juan de Fuca Plate. Parts of California and the Mexican state of Baja California sit on the enormous Pacific Plate.

Parts of Baja California and the Mexican states of Baja California Sur, Sonora, Sinaloa, and Jalisco sit on the Cocos Plate. The Caribbean Plate carries most of the small islands of the Caribbean Sea (south of the island of Cuba) as well as Central America from Honduras to Panama. The Hawaiian Islands, in the middle of the Pacific Ocean on the Pacific Plate, are usually considered part of North America. South America South America is connected to North America by the narrow Isthmus of Panama. These two continents weren’t always connected; they came together only 3 million years ago. South America is the fourth-largest continent and extends from the sunny beaches of the Caribbean Sea to the frigid waters near the Antarctic Circle. South America’s southernmost islands, called Tierra del Fuego , are less than 1,120 kilometers (700 miles) from Antarctica. These islands even host some Antarctic birds, such as penguins, albatrosses, and terns. Early Spanish explorer s visiting the islands for the first time saw small fires dotting the land.

These fires, made by indigenous people, seemed to float on the water, which is probably how the islands got their name—Tierra del Fuego means "Land of Fire." The Andes, the Earth’s longest terrestrial mountain range, stretch the entire length of South America. Many active volcano es dot the range. These volcanic areas are fueled by heat generated as a large oceanic plate, called the Nazca Plate, grinds beneath the plate carrying South America. The central-southern area of South America has pampas , or plains. These rich areas are ideal for agriculture . The growing of wheat is a major industry in the pampas. Grazing animal s, such as cattle and sheep, are also raised in the pampas region. In northern South America, the Amazon River and its tributaries flow through the world’s largest tropical rain forest . In volume, the Amazon is the largest river in the world. More water flows from it than from the next six largest rivers combined. South America is also home to the world’s tallest waterfall , Angel Falls, in the country of Venezuela. Water flows more than 979 meters (3,212 feet)—almost a mile.

The falls are so high that most of the water evaporate s into mist or is blown away by wind before it reaches the ground. South American rain forests contain an enormous wealth of animal and plant life. More than 15,000 species of plants and animals are found only in the Amazon River basin . Many Amazonian plant species are sources of food and medicine for the rest of the world. Scientists are trying to find ways to preserve this precious and fragile environment as people move into the Amazon basin and clear land for settlements and agriculture. Twelve independent countries make up South America: Brazil, Colombia, Argentina, Peru, Venezuela, Chile, Ecuador, Bolivia, Paraguay, Uruguay, Guyana, and Suriname. The territories of French Guiana, part of France, and the Falkland Islands, part of the United Kingdom, are also part of South America. Almost all of South America sits on top of the South American Plate. Europe Europe, the sixth-largest continent, contains just 7 percent of the world’s land. In total area, the continent of Europe is only slightly larger than the country of Canada. However, the population of Europe is more than twice that of South America.

Europe has more than 40 countries and many of the world’s major cities, including London, England; Paris, France; Berlin, Germany; Rome, Italy; Madrid, Spain; and Moscow, Russia. Most European countries have access to the ocean. The continent is bordered by the Arctic Ocean in the north, the Atlantic Ocean in the west, the Caspian Sea in the southeast, and the Mediterranean and Black Seas in the south. The nearness of these bodies of water and the navigation of many of Europe’s rivers played a major role in the continent’s history. Early Europeans learned the river systems of the Volga, Danube, Don, Rhine, and Po, and could successfully travel the length and width of the small continent for trade , communication , or conquest . Navigation and exploration outside of Europe was an important part of the development of the continent’s economic , social, linguistic, and political legacy . European explorers were responsible for colonizing land on every continent except Antarctica. This colonization process had a drastic impact on the economic and political development of those continents, as well as Europe. In the east, the Ural Mountains separate Europe from Asia. The nations of Russia and Kazakhstan straddle both continents.

Another range, the Kjølen Mountains, extends along the northern part of the border between Sweden and Norway. To the south, the Alps form an arc stretching from Albania to Austria, then across Switzerland and northern Italy into France. As the youngest and steepest of Europe’s mountains, the Alps geologically resemble the Rockies of North America, another young range. A large area of gently rolling plains extends from northern France eastward to the Urals. A climate of warm summers, cold winters, and plentiful rain helps make much of this European farmland very productive. The climate of Western Europe, especially around the Mediterranean Sea, makes it one of the world’s leading tourism destinations. Almost all of Europe sits on the massive Eurasian Plate. Africa Africa, the second-largest continent, covers an area more than three times that of the United States. From north to south, Africa stretches about 8,000 kilometers (5,000 miles). It is connected to Asia by the Isthmus of Suez in Egypt. The Sahara, which covers much of North Africa, is the world’s largest hot desert .

The world’s longest river, the Nile, flows more than 6,560 kilometers (4,100 miles) from its most remote headwater s in Lake Victoria to the Mediterranean Sea in the north. A series of falls and rapids along the southern part of the river makes navigation difficult. The Nile has played an important role in the history of Africa. In ancient Egyptian civilization , it was a source of life for food , water, and transportation. The top half of Africa is mostly dry, hot desert. The middle area has savanna s, or flat, grassy plains. This region is home to wild animals such as lions, giraffes, elephants, hyenas, cheetahs, and wildebeests. The central and southern areas of Africa are dominate d by rain forests. Many of these forests thrive around Africa’s other great rivers, the Zambezi, the Congo, and the Niger. However, trees are being cut down in Africa’s rain forests for many of the same reasons deforestation is taking place in the rain forests of South America and Asia: development for businesses, homes, and agriculture. Much of Africa is a high plateau surrounded by narrow strips of coastal lowlands.

Hilly uplands and mountains rise in some areas of the interior. Glaciers on Mount Kilimanjaro in Tanzania sit just miles from the tropical jungles below. Even though Kilimanjaro is not far from the Equator, snow covers its summit all year long. In eastern Africa, a giant depression called the Great Rift Valley runs from the Red Sea to the country of Mozambique. (The rift valley actually starts in southwestern Asia.) The Great Rift Valley is a site of major tectonic activity, where the continent of Africa is splitting into two. Geologists have already named the two parts of the African Plate. The Nubian Plate will carry most of the continent, to the west of the rift; the Somali Plate will carry the far eastern part of the continent, including the so-called “ Horn of Africa .” The Horn of Africa is a peninsula that resembles the upturned horn of a rhinoceros. The countries of Eritrea, Ethiopia, Djibouti, and Somalia sit on the Horn of Africa and the Somali Plate. Africa is home to 56 countries but only 14 percent of the world’s total population.

The area of central-eastern Africa is important to scientists who study evolution and the earliest origins of humanity. This area is thought to be the place where hominid s began to evolve. The entire continent of Africa sits on the African Plate. Asia Asia, the largest continent, stretches from the eastern Mediterranean Sea to the western Pacific Ocean. There are more than 40 countries in Asia. Some are among the most-populated countries in the world, including China, India, and Indonesia. Sixty percent of the Earth’s population lives in Asia. More than a third of the world’s people live in China and India alone. The continent of Asia includes many islands, some of them countries. The Philippines, Indonesia, Japan, and Taiwan are major island nations in Asia. Most of Asia’s people live in cities or fertile farming areas near river valley s, plains, and coasts. The plateaus in central Asia are largely unsuitable for farming and are thinly populated. Asia accounts for almost a third of the world’s land. The continent has a wide range of climate regions, from polar in the Siberia n Arctic to tropical in equatorial Indonesia. Parts of central Asia, including the Gobi Desert in China and Mongolia, are dry year-round.

Southeast Asia, on the other hand, depends on the annual monsoon s, which bring rain and make agriculture possible. Monsoon rains and snowmelt feed Asian rivers such as the Ganges, the Yellow, the Mekong, the Indus, and the Yangtze. The rich valley between the Tigris and Euphrates rivers in western Asia is called the “ Fertile Crescent ” for its place in the development of agriculture and human civilization. Asia is the most mountainous of all the continents. More than 50 of the highest peaks in the world are in Asia. Mount Everest, which reaches more than 8,700 meters (29,000 feet) high in the Himalaya range, is the highest point on Earth. These mountains have become major destination spots for adventurous travelers. Plate tectonics continuously push the mountains higher. As the landmass of India pushes northward into the landmass of Eurasia, parts of the Himalayas rise at a rate of about 2.5 centimeters (1 inch) every five years.

Asia contains not only the Earth’s highest elevation, but also its lowest place on land: the shores of the Dead Sea in the countries of Israel and Jordan. The land there lies more than 390 meters (1,300 feet) below sea level. Although the Eurasian Plate carries most of Asia, it is not the only one supporting major parts of the large continent. The Arabian Peninsula, in the continent’s southwest, is carried by the Arabian Plate. The Indian Plate supports the Indian peninsula, sometimes called the Indian subcontinent . The Australian Plate carries some islands in Indonesia. The North American Plate carries eastern Siberia and the northern islands of Japan. Australia In addition to being the smallest continent, Australia is the flattest and the second-driest, after Antarctica. The continent is sometimes called Oceania, to include the thousands of tiny islands of the Central and South Pacific, most notably Melanesia, Micronesia, and Polynesia (including the U.S. state of Hawaii). However, the continent of Australi itself includes only the nation of Australia, the eastern portion of the island of New Guinea (the nation of Papua New Guinea) and the island nation of New Zealand.

Australia covers just fewer than 8.5 million square kilometers (about 3.5 million square miles). Its population is about 31 million. It is the most sparse ly populated continent, after Antarctica. A plateau in the middle of mainland Australia makes up most of the continent’s total area. Rainfall is light on the plateau, and not many people have settled there. The Great Dividing Range, a long mountain range, rises near the east coast and extends from the northern part of the territory of Queensland through the territories of New South Wales and Victoria. Mainland Australia is known for the Outback , a desert area in the interior. This area is so dry, hot, and barren that few people live there. In addition to the hot plateaus and deserts in mainland Australia, the continent also features lush equatorial rain forests on the island of New Guinea, tropical beaches, and high mountain peaks and glaciers in New Zealand. Most of Australia’s people live in cities along the southern and eastern coasts of the mainland. Major cities include Perth, Sydney, Brisbane, Melbourne, and Adelaide, all in Australia. Biologists who study animals consider Australia a living laboratory.

When the continent began to break away from Antarctica more than 60 million years ago, it carried a cargo of animals with it. Isolated from life on other continents, the animals developed into creatures unique to Australia, such as the koala, the platypus, and the Tasmanian devil. The Great Barrier Reef, off mainland Australia’s northeast coast, is another living laboratory. The world’s largest coral reef ecosystem, it is home to thousands of species of fish, sponges, marine mammals, corals, and crustacean s. The reef itself is 1,920 kilometers (1,200 miles) of living coral communities. By some estimates, it is the world’s largest living organism. Most of Australia sits on the Australian Plate. The southern part of the South Island of New Zealand sits on the Pacific Plate. Antarctica Antarctica is the windiest, driest, and iciest place on Earth. Antarctica is larger than Europe or Australia, but unlike those continents, it has no permanent population. People who work there are scientific research ers and support staff, such as pilots and cooks. The climate of Antarctica makes it impossible to support agriculture or a permanent civilization.

Temperatures in Antarctica, much lower than Arctic temperatures, plunge lower than -73 degrees Celsius (-100 degrees Fahrenheit). Scientific bases and laboratories have been established in Antarctica for studies in fields that include geology , oceanography , and meteorology . The freezing temperatures of Antarctica make it an excellent place to study the history of Earth’s atmosphere and climate. Ice core s from the massive Antarctic ice sheet have recorded changes in Earth’s temperature and atmospheric gases for thousands of years. Antarctica is also an ideal place for discovering meteorite s, or stony objects that have impacted the Earth from outer space. The dark meteorites, often made of metals like iron, stand out from the white landscape of most of the continent. Antarctica is almost completely covered with ice, sometimes as thick as 3.2 kilometers (2 miles). In winter, Antarctica’s surface area may double as pack ice builds up in the ocean around the continent. Like all other continents, Antarctica has volcanic activity. The most active volcano is Mount Erebus, which is less than 1,392 kilometers (870 miles) from the South Pole. Its frequent eruptions are evidence of hot, molten rock beneath the continent’s icy surface.

Antarctica does not have any countries. However, scientific groups from different countries inhabit the research stations. A multinational treaty negotiated in 1959 and reviewed in 1991 states that research in Antarctica can only be used for peaceful purposes. McMurdo Station, the largest community in Antarctica, is operated by the United States. Vostok Station, where the coldest temperature on Earth was recorded, is operated by Russia. All of Antarctica sits on the Antarctic Plate. Term agriculture Noun line of latitude at 66.5 degrees south that encircles the continent of Antarctica. arc part of the outline of a circle. atmosphere bay Noun body of water partially surrounded by land, usually with a wide mouth to a larger body of water. goods carried by a ship, plane, or other vehicle. cattle region that connects North America and South America, including the Isthmus of Panama. civilization coastal range Noun recently formed mountains found near the coast of continents, especially the western coasts of the Americas. coastline outer boundary of a shore. colonize to establish control of a foreign land and culture. communication sharing of information and ideas. complex thick layer of Earth that sits beneath continents.

continental shelf tiny ocean animal, some of which secrete calcium carbonate to form reefs. coral reef rocky ocean features made up of millions of coral skeletons. core old, stable part of continental crust, made up of shields and platforms. crust crustacean Noun type of animal (an arthropod) with a hard shell and segmented body that usually lives in the water. culture learned behavior of people, including their languages, belief systems, social structures, institutions, and material goods. debris remains of something broken or destroyed; waste, or garbage. deforestation destruction or removal of forests and their undergrowth. descend to go from a higher to a lower place. desert Noun construction or preparation of land for housing, industry, or agriculture. distinct dust Noun microscopic particles of rocks or minerals drifting in space. Also called cosmic dust or space dust. economic having to do with money. ecosystem landmass including the continents of Europe and Asia. evaporate to change from a liquid to a gas or vapor. evolution change in heritable traits of a population over time. exploration study and investigation of unknown places, concepts, or issues. explorer person who studies unknown areas. extensive able to produce crops or sustain agriculture.

Fertile Crescent region extending from the eastern Mediterranean coast through Southwest Asia to the Persian Gulf. flood water that is not salty. frigid to combine or meld together. gas Noun state of matter with no fixed shape that will fill any container uniformly. Gas molecules are in constant, random motion. geographer person who studies places and the relationships between people and their environments. geologic having to do with the physical formations of the Earth. geologist person who studies the physical formations of the Earth. geology Noun study of the physical history of the Earth, its composition, its structure, and the processes that form and change it. geyser largest species of tree on Earth. glacial period time of long-term lowering of temperatures on Earth. Also known as an ice age. glacier physical force by which objects attract, or pull toward, each other. grazing animal animal that feeds on grasses, trees, and shrubs. Great Lakes Noun largest freshwater bodies in the world, located in the United States and Canada. Lake Huron, Lake Ontario, Lake Michigan, Lake Erie, and Lake Superior make up the Great Lakes. Great Plains grassland region of North America, between the Rocky Mountains and the Mississippi River.

headwater biological family of primates, including humans, chimpanzees, gorillas, and orangutans, and their ancestors. Horn of Africa Noun large peninsula in northeast Africa, including the countries of Somalia, Djibouti, Eritrea, and Ethiopia. Also called the Somali Peninsula. ice age Noun long period of cold climate where glaciers cover large parts of the Earth. The last ice age peaked about 20,000 years ago. Also called glacial age. ice core sample of ice taken to demonstrate changes in climate over many years. ice sheet rock formed by the cooling of magma or lava. Indian subcontinent landmass in south-central Asia carried by the Indian tectonic plate, including the peninsula of India. indicate characteristic to or of a specific place. industry activity that produces goods and services. iron chemical element with the symbol Fe. island to set one thing or organism apart from others. isthmus tropical ecosystem filled with trees and underbrush. laboratory place where scientific experiments are performed. Also called a lab. landform molten rock, or magma, that erupts from volcanoes or fissures in the Earth's surface.

legacy Noun material, ideas, or history passed down or communicated by a person or community from the past. linguistic having to do with language or speech. magma substance used for treating illness or disease. metal category of elements that are usually solid and shiny at room temperature. meteorite a type of large continental island. mist solid material turned to liquid by heat. monsoon Noun seasonal change in the direction of the prevailing winds of a region. Monsoon usually refers to the winds of the Indian Ocean and South Asia, which often bring heavy rains. landmass that forms as tectonic plates interact with each other. mountain range series or chain of mountains that are close together. navigation tectonic plate currently being formed in western Africa as the African Plate splits in two. ocean region including island groups in the South Pacific. oceanic crust thin layer of the Earth that sits beneath ocean basins. oceanography the way mountains are formed. Outback remote, sparsely populated interior region of Australia. pack ice large area of drift ice, or ice not attached to a shoreline. Pampas flat grasslands of South America.

Pangaea supercontinent of all the Earth's landmass that existed about 250 million years ago. peninsula movement and interaction of the Earth's plates. platform Noun ancient rocks that formed as part of continental crust, now overlain with sediment and sedimentary rock, located in the interior of continents. polar having to do with the North and/or South Pole. Polynesia island group in the Pacific Ocean between New Zealand, Hawaii, and Easter Island. precious region Noun any area on Earth with one or more common characteristics. Regions are the basic units of geography. something that is left over. remote research Noun scientific observations and investigation into a subject, usually following the scientific method: observation, hypothesis, prediction, experimentation, analysis, and conclusion. research station Noun structure or structures built for scientific study of the surrounding region, possibly including residential and lab facilities. rift valley tributaries, mouth, source, delta, and flood plain of a river. savanna type of tropical grassland with scattered trees. sea level Noun rock formed from fragments of other rocks or the remains of plants or animals. shield Noun ancient rocks that formed as part of continental crust and are located in the interior of continents.

Siberia region of land stretching across Russia from the Ural Mountains to the Pacific Ocean. snow precipitation made of ice crystals. snowmelt top layer of the Earth's surface where plants can grow. Somali plate tectonic plate currently being formed in eastern Africa as the African plate splits in two. sparse scattered and few in number. stable to be on both sides of an issue, area, or object. subduct to pull downward or beneath something. subduction process of one tectonic plate melting, sliding, or falling beneath another. subduction zone area where one tectonic plate slides under another. summit to reach the highest point of a mountain. supercontinent ancient, giant landmass that split apart to form all the continents we know today. tectonic plate Noun massive slab of solid rock made up of Earth's lithosphere (crust and upper mantle). Also called lithospheric plate. terrestrial having to do with the Earth or dry land. theorize to formulate and propose a group of ideas to explain a scientific question. tide Noun rise and fall of the ocean's waters, caused by the gravitational pull of the moon and sun. group of islands at the southern tip of South America.

tourism the industry (including food, hotels, and entertainment) of traveling for pleasure. trade buying, selling, or exchanging of goods and services. tropical Adjective existing in the tropics, the latitudes between the Tropic of Cancer in the north and the Tropic of Capricorn in the south. unique depression in the Earth between hills. vast all the plant life of a specific place. volcanic island land formed by a volcano rising from the ocean floor. volcano Noun an opening in the Earth's crust, through which lava, ash, and gases erupt, and also the cone built by eruptions. History of Oceania | Essential Humanities Main Article Definition Oceania is the name for the vast, island-dotted swath of the Pacific that lies beyond maritime Southeast Asia. (Oceania is distinct from Southeast Asia in that the history and culture of Oceania are not strongly linked to the Asian mainland.) Oceania contains thousands of islands, scattered across thousands of miles of ocean.

Although civilization (urban life) never emerged among these islands (prior to the modern age), they were governed by a rich mosaic of non-urban cultures.3 Culture Areas Oceania can be divided into four main culture areas: Australia, Melanesia , Micronesia , and Polynesia . Each culture area features distinct forms of subsistence, art (see Oceanian Art ), religion, and so on. Notably, while hunter-gatherer life (especially fishing) and agriculture were both practised in the three island regions, Australia retained a purely hunter-gatherer lifestyle.3 Traditional Subsistence in Oceania Melanesia Polynesia The largest component of Oceania is Australia, which (being a continent) is not considered an island. The next-largest land mass is New Guinea, the world's second-largest island (after Greenland). New Guinea is by far the largest component of Melanesia. The next-largest Oceanian islands are the south and north islands of New Zealand, the largest component of Polynesia. Oceania was colonized by waves of migration emanating from Southeast Asia. The first waves, which occurred during the Paleolithic, colonized Melanesia and Australia.

(These migrants could easily reach Melanesia and Australia due to the lower sea level during the Paleolithic.) Later waves, which occurred during antiquity, colonized Micronesia and Polynesia.1 The native peoples of Melanesia and Australia are quite dark-skinned, while the peoples of Micronesia and Polynesia are generally lighter in complexion.1 The name of each island region is descriptive: the prefix mela- means "dark" (because the inhabitants of Melanesia are so dark), micro- means "small" (because the islands of Micronesia are so small), and poly- means "many" (because the islands of Polynesia are so numerous). The social groups of non-urban peoples, which are typically based on extended family, are known as tribes (or "clans"). The tribes of Australia were semi-nomadic; they did not travel constantly, but rather migrated periodically between settlements, with each tribe controlling a portion of the Australian continent.

In the other three culture areas, the territory controlled by a given tribe might consist of a portion of an island, an entire island, or even multiple islands.K216-17,3,7 Modern Oceania Europeans gradually explored Oceania throughout the Early Modern and modern ages. The single most prolific explorer of the region was James Cook, whose many achievements include the first major expedition to Australia. Unfortunately, Western activity in Oceania was no less destructive than elsewhere. Most islands were seized as colonies (by European nations and the United States), populations were decimated by European diseases, and many natives were forced into slavery.1 Oceania was a major theatre of World War II, where the Allies battled the Japanese for control of the Pacific (see World War II ). In the period ca. WWII-1980 (the "age of decolonization"), most colonies achieved independence. Today, the islands of Oceania are grouped into over a dozen nations.1 Island Types Oceania features many examples of all three major island types: continental, volcanic, and coral. These types are distinguished according to some basic principles of geology.

The Earth consists of four layers: a solid inner core, a liquid outer core, a liquid mantle, and a solid crust. The crust, which floats on the mantle, can be divided into two types: continental crust, which is thick and light, and oceanic crust, which is thin and dense.4 Continental crust rises above the ocean (thus providing dry land), while oceanic crust lies far underwater. The edges of continental crust also lie underwater; this is termed the continental shelf. A continental island (the most common type) is simply a bump in the continental shelf that rises above the water. A volcanic island (aka oceanic island), on the other hand, rises all the way up from oceanic crust. A volcanic island forms when liquid rock spurts up from the mantle and hardens; in other words, a volcanic island is the tip of a volcano.5 A coral island is formed by a coral reef that grows in shallow water. Shallow-water coral can grow in two places: upon a continental shelf, or upon the underwater slopes immediately around a volcanic island.

A coral island does not result from coral growing up above the surface of the water (where it would die), but rather from the accumulation of rocky debris upon the reef (which is often stirred up by storms) or by an upward shift in the earth's crust directly below the reef (which happens mainly along fault lines, where volcanic islands are usually found).6 A coral island that forms around a volcanic island is shaped like a ring (or a partial ring). If the volcanic island erodes away, all that remains is an atoll : a ring-shaped coral island surrounding a lagoon. 1 - "Oceania", Encarta 2004.

Question: Excluding Australia and continental land masses what is the largest island in the world?
Answer: Greenland