In a lake,cooler water on top sinks below warmer water on bottom during

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In the fall as air temperatures cool the epilimnion also cools and eventually these water become cooler than the waters of the hypolimnion. At this time the upper waters sink to the bottom and the waters of the hypolimnion rise. This mixes the waters until the temperature is uniform throughout the lake. This also mixes oxygen from the upper waters and nutrients from the lower waters throughout the lake.Bloom's

In a Lake,cooler Water on Top Sinks Below Warmer Water