A lake is a body of fresh or salt water which is completely surrounded by land. Lakes have drainage basins that feed them with water and sediment, and these basins are generally fed by streams. All lakes have one or more forms of outflow: a stream, seepage through the ground, or evaporation. Lakes are formed through many natural processes: tectonic rifting, volcanic activity, meteoric impact, migration and abandonment of old channel sections by meandering streams, glacial erosion. There are many types of lakes (Fjord Lakes, Proglacial Lakes, Aeolic Lakes), this picture is of an artificial lake (reservoir). Artificial lakes are formed by damming streams to provide water for domestic, recreational, industrial, and agricultural uses, irrigation, and the generation of electricity, and to control stream discharge (flood and erosion prevention).
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