Many bleaches can kill bacteria easily. For this reason, they are often used for disinfecting or sterilisation.
Mixing bleach with some things commonly found at home, like vinegar or even fruit juice can produce chemicals like chlorine that are irritating or even dangerous. Bleach should also not be mixed with ammonia because a hazardous chemical reaction will occur. This effect can kill people.
Certain types of bleaches produce toxic waste. Some of them produce dioxins..
Bleach made from hydrogen peroxide is used to make hair lighter in color, orange, blonde, or even white. It is often used by dark-haired people to make highlights, and most hair dyes contain it.
Polygon
A polygon is a closed two-dimensional shape. It is a simple curve that is made up of straight line segments. It usually has three sides and three corners or more.
It could also be referred to as 'A closed plane figure bound by three or more straight line segments'. It has a number of sides, also called edges. A square is a polygon because it has four sides. The smallest possible polygon in a Euclidean geometry or "flat geometry" is the triangle, but on a sphere, there can be a digon and a henagon.
If the edges (lines of the polygon) do not intersect (cross each other), the polygon is called "simple", otherwise it is "complex".
In computer graphics, polygons (especially triangles) are often used to make graphics.
Kazakhstan
Kazakhstan is a country in the middle of Eurasia. Its official name is the Republic of Kazakhstan. Kazakhstan is the ninth biggest country in the world, and it is also the biggest landlocked country in the world. Before the end of the Soviet Union, it was called "Kazakh Soviet Socialist Republic". The president of the country from 1991 through March 2019 was Nursultan Nazarbayev. Nur-Sultan is the capital city of Kazakhstan. Almaty was the capital until 1998, when it moved to Nur-Sultan, which was called Astana at that time.
The Kazakh language which is a Turkic language is the native language, but Russian has equal official status for all administrative and institutional purposes. Islam is the largest religion about 70% of the population are Muslims, with Christianity practiced by 26%; Russia leases (rents) the land for the Baikonur Cosmodrome (site of Russian spacecraft launches) from Kazakhstan.
Kazakhstan is a transcontinental country mostly in Asia with a small western part across the Ural River in Europe. It has borders with the Russian Federation in the north and west, Turkmenistan, Uzbekistan and Tajikistan in the southwest, and China in the far east. The northern border is mostly with Siberia, Russia, so Russia has the longest border with Kazakhstan. Basically, Kazakhstan runs from the Caspian Sea in the west to the mainly Muslim Chinese autonomous region of Xinjiang.
Kazakhstan has no ocean shoreline, but borders the Caspian Sea, which boats use to get to neighboring countries. The Caspian Sea is an Endorheic basin without connections to any ocean.
Kazakhstan has plenty of petroleum, natural gas, and mining. It attracted over $40 billion in foreign investment since 1993 and accounts for some 57% of the nation's industrial output. According to some estimates, Kazakhstan has the second largest uranium, chromium, lead, and zinc reserves, the third largest manganese reserves, the fifth largest copper reserves, and ranks in the top ten for coal, iron, and gold. It is also an exporter of diamonds. Kazakhstan has the 11th largest proven reserves of both petroleum and natural gas.
Kazakhstan is divided into 14 provinces. The provinces are divided into districts.
Almaty and Nur-Sultan cities have the status of State importance and are not in any province. Baikonur city has a special status because it is leased to Russia for Baikonur cosmodrome until 2050.
Each province is headed by an Akim (provincial governor) appointed by the president. Municipal Akims are appointed by province Akims. The Government of Kazakhstan moved its capital from Almaty to Nur-Sultan on December 10, 1997.
The population of Kazakhstan is 17,165,000. It takes the 62th place in the List of countries by population. Average density is one of the lowest on earth with almost 6 people/km ( List of countries by population density).
Notes
Sign
A sign is something you see (or hear) which means something. A sign may be natural or man-made.
A natural sign shows something significant. Leaves turn brown and fall off deciduous trees in the autumn. Temperatures drop, daylight hours shorten. It suggests winter is coming. Many birds migrate and some mammals hibernate in response to natural signs like these. Humans, as usual, are a bit different. They make their own signs.
A man-made sign is called a signal or symbol. It is an artificial thing, which people decide means something in their society. For example, the stop sign on the road tells the person that they must stop their car there. So does a red traffic light. They are signals with a legal meaning, and people learn what these meanings are.
Sometimes a person may not know what a sign means. Feeling a cold wind could be a sign that someone left a door or window open.
In medicine, a sign is something seen, whereas a symptom is something felt, like a pain. A sign might be something like high blood pressure, which can be measured.
A road sign or traffic sign is something that gives information by means of a symbol, or in only 1 or 2 words. It helps people in their vehicles on the road. Some signs include: Give way, Stop, Keep left, No U-turn, no parking, Zebra crossing and much more. Signs are very useful. Without signs and traffic lights there would be many accidents and arguments on the road.
Barley
Barley is a member of the grass family of plants. Its seeds are a cereal grain. It is a staple food of humans and other animals, and it is one of mankind's oldest crops. It can be made into flour or beer.
Its Latin name is "Hordeum vulgare". Barley is an annual plant.
Mount Vesuvius
Mount Vesuvius (, ) is a stratovolcano on the Gulf of Naples, Italy. It is about 9 kilometres (5.6 mi) east of Naples. It is the only volcano on the mainland of Europe that erupted in the last 100 years. The last major eruption was in 1944. Two other important active volcanos in Italy are on islands. They are Etna and Stromboli.
Mount Vesuvius is best known for its eruption in AD 79 which destroyed the Roman cities of Pompeii and Herculaneum. They were never built again. The towns were buried in ash so completely that later people who lived there forgot about them until they were accidentally discovered in the late 18th century.
The eruption also changed the way the Sarno River flowed, and raised the sea beach. Because of this, Pompeii was not on the river nor next to the coast anymore. Mount Vesuvius was also greatly changed. Many of the plants there died, and the top of the mountain looked different because of the strong eruption.
Vesuvius has erupted numerous times after that. Today, it is one of the most dangerous volcanoes in the world because 3,000,000 people live near this explosive volcano. More people live near Mount Vesuvius than any other volcano in the world.
Vesuvius has a long tradition of history and literature. A serpent (snake) called "Vesuvius" has been used in frescos of many "lararia" (household temples) from Pompeii. In Capua, the words "IOVI VESVVIO" ("Jupiter Vesuvius") show that he was worshipped as a power of Jupiter.