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In cold countries, water does not freeze at the bottom of a lake in winter, on account of

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anomalous expansion of water between 4°C and 0°C

ice being lighter than water

ice being poor conductor of heat

all the above three factors

answer is D.

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Detailed Solution

The bottom of a lake do not freeze in severe winter. The reason is that ice is a poor conductor of heat hence once the surface is frozen no further heat is liberated or absorbed by water beneath ice. Therefore water below ice never freezes.

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