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Lakes By Kristi Adams John Bein The Great Lakes The Great Lakes What is a lake? • A basin in the landscape that collects water. • Basins are formed by glaciers, volcanoes, and shifting of the earth’s crust. Physical Conditions • Light absorption determines the color of a lake. Structure of a lake • A lake is divided into three depth zones: • Epilimnion- warm surface layer • Metalimnion- temperature changes 1°C per meter of depth • Hypolimnion- cold and dark waters Flora Fauna Human Influences • Run off from rain storms • Fertilizer from our lawns
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