Most lakes are the result of glacial erosion during ice ages. Glaciers hollowed out deep basins, often depositing moraine to form natural dams. Most lakes have an outflowing stream: where there is great water loss through evaporation there is no such stream and the lake water is extremely saline (see also evaporites), as in the Dead Sea. Lakes are comparatively temporary features of the landscape as they are constantly being infilled by silt.
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Related category GEOGRAPHY
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