Lake – a mass of water or other liquid of considerable size, situated on the land. The large number of lakes on Earth is freshwater, and most lie in the Northern hemisphere at higher latitudes. In the ecology of the surrounding lake environment is referred to as lacustrine deposits. Large lakes are sometimes referred to as “inland seas” and small seas are sometimes referred to as lakes. Small lakes tend to put the word “lake” after the name, as in Green Lake, while larger lakes often invert the word order, as in Lake Ontario, at least in North America.
Most lakes have a natural outflow in the form of a river or stream, but some have not, and lose water solely by evaporation and/or underground leakage. They are called internal lakes.
The term “lake” is also used to describe such a feature as lake Eyre, which is a dry basin most of the time, but can be filled with seasonal heavy rains.
Many lakes are artificial and constructed for hydro-electric power, regional purposes, industrial use, agricultural use or domestic water supply.
Evidence of extraterrestrial lakes exists. The testimony of lakes filled with methane, was approved by NASA to return the automatic research station “Cassini” – observing satellite Titan, which moves around the planet Saturn.
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