What term refers to the coldest and densest layer deep below a lake's surface?
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The term that refers to the coldest and densest layer deep below a lake's surface is the hypolimnion. In a stratified lake, the water column can be divided into three main layers during the warm season: the epilimnion, the metalimnion, and the hypolimnion. The hypolimnion is the deepest layer, and it typically has the coolest temperatures because it is furthest from the sun's warming effect. The water in the hypolimnion is denser because cold water is more dense than warm water.