LAKE

A lake is a water area that is formed naturally, in the form of a very wide water basin. A lake is a large depression on the surface of the earth that is filled with fresh or salt water, the entire basin is surrounded by land.

On average, lakes have a shallow depth and the water comes from various sources such as springs, ground water, river water and rain water. Most lakes are fresh water and many are also located in the northern hemisphere at higher altitudes. A periglacial lake is a lake in which a layer of ice, or glacier, forms, covering the water flowing out of the lake.

The term lake is also used to describe phenomena such as Lake Eyre, where the lake is dry most of the time and only fills during the rainy season. Many lakes are artificial and deliberately built to provide hydro-electric power, recreation (swimming, windsurfing, etc.), water supply, etc. Finland is known as the "Land of a Thousand Lakes and Minnesota is known as the "Land of Ten Thousand Lakes". The Great Lakes of North America also have their origins in the Ice Age. About 60% of the world's lakes are located in Canada; this is due to the chaotic drainage system that dominates the country.

On the moon there are dark areas of basalt, similar to the lunar mare but smaller, called lacus (from Latin for "lake"). They are thought by astronomers to be lakes. A lake is a form of ecosystem that occupies a relatively small area on the earth's surface. The area occupied by a lake is smaller than that of the sea and land. The lake has a positive impact on the people living around the lake area.

Type:

1. TECTONIC LAKE

Tectonic lakes are lakes that are formed due to subsidence of the earth's surface due to shifts/faults.

2. VOLCANIC LAKE

Volcanic lakes are lakes formed due to volcanism/volcanic activity

3. TECTOVOLCANIC LAKE

Tectovolcanic lakes are lakes formed due to a mixture of tectonic and volcanic activity

4. KARST LAKE

Karst lakes or lokva are lakes formed due to erosion or dissolution of limestone. The formation of karst lakes only occurs in areas with abundant limestone. Basins are formed in limestone that has experienced erosion. After that, the basin filled with water and formed a lake. Many karst lakes are formed in Gunungkidul Regency and the Batu Limestone Mountains in East Kutai Regency.

5. GLACIAL LAKE

Glacial lakes Glacial lakes are formed due to the erosion of the valley floor by glaciers. In summer or autumn, melting glaciers fill the depressions they pass through, forming lakes

FUNCTION:

Lakes have the main function of stabilizing water flow. Apart from that, lakes also have a very high economic function, namely to provide clean water, both for drinking, irrigation and industry, as well as for aquaculture and capture fisheries. If managed properly, the lake will function optimally as a support for life. Maintaining the quantity and quality of lake water is expected to ensure the availability of raw water throughout its flow area. [6] Other functions of lakes are water sources, supporting biodiversity functions, means of transportation and sports and tourism, dampening flood fluctuations in rivers, sources and places for protein formation, controlling toxicity in water bodies, sources that replenish groundwater, climate control, and their position, which is central in tradition, culture and religion

 Sumber Gambar : https://en.wikipedia.org/wiki/Lake#/media/File:Gentau_Pic_du_Midi_Ossau.jpg

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