Why do lakes freeze from top towards bot...

Why do lakes freeze from top towards bottom ?

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There are intermolecular hydrogen bonding in `H_(2)O` molecules. The density of water is greater than ice. It may be noted that at `4^(@)C` water has maximum density. In severe cold the upper layer of the sea water freezes and the heavier surface of ice. Due to this sea animals live safely in water.

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CENGAGE CHEMISTRY ENGLISH-HYDROGEN, WATER AND HYDROGEN PEROXIDE-Ex 3.2

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