If water in a lake were to behave like other liquids, then in extremely cold weather it would freeze
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This is due to "anomalous expansion of water". Water has its maximum density at 4 degrees C. Now on heating or cooling water, density of water decrease and ice is even less dense than water. As a result, when water freezes into ice the ice floats on water.
This has 2 advantages. Firstly, it act as an insulator and the water below it is warmer. And secondly, the ice does not reach the bottom of the water. Hence, the organisms are capable of living under the ice where there is water.
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