What is the reason for the hot water and cold water of the pond ?

What is the reason for the hot water and cold water of the pond ?
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Answer :

We know that rain water is very cold. The water in the pond absorbs the heat of the sun. So when the cold rain water falls in the pond, there is a combination of heat between the pond water and the rain water. So the water in the pond gets hot and the rain water gets cold.
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