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the surface of a lake is frozen in severe winter, but the water at its bottom is still liquid. what is the reason

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Q.

The surface of a lake is frozen in severe winter, but the water at its bottom is still liquid. What is the reason ?

[A] Ice is bad conductor of heat.

[B] The density of water is maximum at 4⁰C.

[C] Since the surface of the lake is at the same temperature as the air, no heat is lost.

[D] None of the statements (A), (B) and (C) given is correct.

Answer & Explanation
Option: [A]

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