January 27, 2022
The lake is a natural depression, a depression, on land filled with water, which is not directly connected to the world sea, and which is relatively large in size. Officially, the classification does not apply to the minimum area to be covered by the lake, but it is often mentioned that the lake should not have an area of less than 1 hectare. Lakes lie on land and are not part of the ocean, so they differ from lagoons, and are also larger deeper than lakes, although there is no formal or scientific definition. Lakes can have tributaries, islands, and a lake that has a tributary and the island is called a flowing lake. The largest and deepest lakes are of tectonic origin. They contain over 95% of the total amount of lake water. These lakes fill the depressions created by tectonic movements, ie tectonic disturbances of the Earth's surface. The largest lake (in terms of area and amount of water) is the Caspian Lake. The lowest lake is the Dead Sea (about 400 m below sea level), the deepest is Lake Baikal (1,620 m). Glacial lakes are the most numerous. The term lake is also used to describe natural features such as Lake Eyre, which is dry most of the time but fills up during seasonal heavy rains. Many lakes are artificial, so they are created for hydroelectric production (converting hydro into electricity - electricity), recreation (swimming ...), water supply, etc. Finland is known as the country of a thousand lakes, and Minnesota as the country of ten thousand lakes. The Great Lakes of North America date back to the Ice Age. Over 60% of the world's lakes are located in Canada, mainly because this country is dominated by an unchained system of runoff. Lakes are important for economy and traffic (Lakes in North America, Caspian Lake); salts are obtained (Dead Sea); some are rich in fish, serve to supply water and regulate water levels in rivers.