An oceanic plate is a tectonic plate at the bottom of the oceans. It is primarily made of mafic rocks, rich in iron and magnesium. It is thinner than the continental crust (generally less than 10 kilometers thick) and denser. It is also younger than continental crust. When they collide, the oceanic plate moves underneath the continental plate because of its density. As a result, it melts in the mantle and reforms. The oldest oceanic rocks are less than 200 million years old.
Continental plate is the thick part of the earth's crust which forms the large land masses. Continental rock has lower density than oceanic rock. They are mostly made of felsic rocks. These have granite, with its abundant silica, aluminum, sodium and potassium. Continental plates are rarely destroyed. Their oldest rocks seem to be 4 billion years old. Oceanic plates cover about 71 percent of Earth’s surface, while continental plates cover 29 percent.
Ocean lithosphere varies in thickness. Because it is formed at mid-ocean ridges and spreads outwards, it gets thicker as it moves further away from the mid-ocean ridge. Typically, the thickness varies from about thick at mid-ocean ridges to greater than at subduction zones.
Continental lithosphere is about thick. It varies between basins, mountain ranges, and the stable cratonic interiors of continents. The two types of crust differ in thickness, with continental crust being much thicker than oceanic: vs. .
The lithosphere consists of "tectonic plates". There are seven major and many minor plates. The lithospheric plates ride on the asthenosphere (aesthenosphere). The plate boundary is where two plates meet. When movement occurs, the plates may create mountains, earthquakes, volcanoes, mid-oceanic ridges and oceanic trenches, depending on which way the plates are moving.
Earthquakes, volcanic activity, mountain-building, and oceanic trench formation occur along plate boundaries. The lateral movement of the plates varies from:
Depending on how they are defined, seven or eight major plates are usually listed:
Lithosphere
The lithosphere is the solid shell of the planet "Earth". That means the crust, plus the part of the upper mantle that behaves elastically on long time scales.
Under the lithosphere is the asthenosphere, the weaker, hotter, and deeper part of the upper mantle. This part can flow.
The lithosphere provides a conductive lid atop the convecting mantle: it reduces heat transport through the Earth, A lithosphere (Ancient Greek: λίθος [lithos] for "rocky", and σφαίρα [sphaira] for "sphere") is the rigid,[1] outermost shell of a terrestrial-type planet or natural satellite that is defined by its rigid mechanical properties. On Earth, it is composed of the crust and the portion of the upper mantle that behaves elastically on time scales of thousands of years or greater. The outermost shell of a rocky planet, the crust, is defined on the basis of its chemistry and mineralogy.
There are two types of lithosphere:
The lithosphere is divided into tectonic plates, which move gradually relative to one another.
Oceanic lithosphere thickens as it ages and moves away from the mid-ocean ridge. This thickening occurs by conductive cooling, which converts hot asthenosphere into lithospheric mantle, and causes the oceanic lithosphere to become increasingly dense with age. Oceanic lithosphere is less dense than asthenosphere for a few tens of millions of years, but after this becomes increasingly denser than asthenosphere.
When a continental plate comes together with an oceanic plate, at a subduction zones, the oceanic lithosphere always sinks beneath the continental.
New oceanic lithosphere is constantly being produced at mid-ocean ridges and is recycled back to the mantle at subduction zones. As a result, oceanic lithosphere is much younger than continental lithosphere: the oldest oceanic lithosphere is about 200 million years old, while parts of the continental lithosphere are billions of years old.
Another distinguishing characteristic of the lithosphere is its flow properties. Under the influence of the low-intensity, long-term stresses that drive tectonic motion, the lithosphere is like a rigid shell. It changes mainly by breaking ("brittle failure"). The asthenosphere (the layer of the mantle below the lithosphere) is heat-softened and adjusts by plastic changes ("deformation").
Oceanic lithosphere is made up of mostly basalt and gabbro. Continental lithosphere is made up of granite and gneiss.
New Jersey Devils
The New Jersey Devils are an ice hockey team that is part of the NHL. They play in the state of New Jersey. They have won the Stanley Cup, awarded to the best team in the NHL, 3 times.
"Statistics above are correct as of April 28, 2010".
These are the top-ten point-scorers in franchise history. Figures are updated after each completed NHL regular season.
"Note: Pos = Position; GP = Games Played; G = Goals; A = Assists; Pts = Points; P/G = Points per game * = still active with the team
"Updated at completion of 2008–2009 season"
Nashville Predators
The Nashville Predators are a professional ice hockey team based in Nashville, Tennessee. They play in the National Hockey League (NHL). Their name is sometimes shortened to the "Preds." They play in Bridgestone Arena (formerly named "Nashville Arena", "Gaylord Entertainment Center", and "Sommet Center"). Their logo is a reference to a partial Smilodon skeleton that was found beneath downtown Nashville in 1971, during the construction of the First American National Bank. The franchise held a vote with the fans to choose a team name. The three candidates that were chosen were: The Ice Tigers, Fury, and Attack. Another choice, Predators, was added to the vote. Predators won the vote, and the new franchise was named the Nashville Predators.
Crookes
Crookes is an area of the City of Sheffield, England, about 2.5 kilometers (1.5 miles) west of the center of the city. It borders Broomhill to the south, Walkley and Crookesmoor to the east and open countryside around the River Rivelin to the north. The area is
thought to have got its name from the Old Norse word "Krkor" which means a corner of land.
Dallas Stars
The Dallas Stars are a professional ice hockey team based in Dallas, Texas. They play in the National Hockey League (NHL). They have won 1 Stanley Cup, in 1999.
The team began in the autumn of 1967, as the Minnesota North Stars. After the 1992-1993 season, the team moved to Dallas. Texas is known as the "Lone Star State". The team changed its name from "North Stars" to just "Stars" when they moved.
Pharmaconomist
Pharmaconomist means expert in pharmaceuticals (expert in medicine).
A pharmaconomist is a Danish person who works in a pharmacy. Just like pharmacists, pharmaconomists have to be trained to work there, and have lots of knowledge about the drugs and treatments that they give out.
Broomhill
Broomhill which includes the areas of Sheffield of Broomhill, Crookesmoor, Endcliffe, and Tapton, is one of the 28 wards in City of Sheffield, in the country of England. It is in the western part of the city and covers an area of 2.7 km. The population of this ward in 2001 was 16,800 people in 5,700 houses.
Broomhill is a suburb of western Sheffield, England. Mostly created in the nineteenth century. The area is just west of the main building of the University of Sheffield, it is known for its large student population, and was identified in 2003 as the richest area apart from London for overall wealth.
Crookesmoor is north of the University of Sheffield's main building housing its law department and sports centre, east of Crookes and south of Walkley. A residential area, it has a large but decreasing student population and is home to Crookes Valley Park.
Endcliffe is southwest of Broomhill and is a rich residential area, housing Birkdale School (aprivate school) and three student buildings, which are part of the University of Sheffield.