Final answer:
The thermocline in deep bodies of water is a region where temperature changes rapidly over a small depth change, separating the epilimnion and hypolimnion.
Explanation:
Thermocline is defined as a layer of water in a body of water where the temperature changes significantly compared to surrounding layers. It is a region of rapid temperature change in deep bodies of water, characterized by a quick temperature shift over a small change in depth. The thermocline typically separates the epilimnion, the warmer upper layer, from the hypolimnion, the colder lower layer.
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