Question

Why does water in lakes freeze in top only why not at bottom in winter? ​

Answer 1

Answer:

The water at the very top of the lake is in direct contact with the cold air, so it freeze first. And because ice is less dense than water the sheet of ice doesn't sink.

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Answer 2

Explanation:

The gravitational weight of all the water higher up in the lake presses down on the water deep in the lake. The pressure allows the water near the bottom of the lake to get cold without expanding and rising. Because of the pressure, the water at the bottom of deep lakes can become cold without freezing to ice.

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