How do lakes form?
A lake is a body of water held in a land depression, with relatively slow turnover.
Formation, concepts and processes
Tectonic basins, glacial erosion, volcanic craters, river barriers and dams create different lake basins. Rain, streams and groundwater add water; evaporation and outflow remove it. Salts can accumulate in basins without outlets.
Examples, applications and limits
Lake level responds to rainfall and water use. Temperature stratification and seasonal mixing in deep lakes can affect oxygen. Freshness or salinity does not depend simply on lake size.
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