The water at the bottom of a lake is cooler than the water at the surface of the lake because:

water is a good conductor of heat

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water is a good conductor of electricity

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water is a bad conductor of heat

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water is a bad conductor of electricity

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Solution

The correct option is C water is a bad conductor of heat
The top layer of water of a lake gets heated up because it is exposed to the heat radiation from the Sun. However, this heat doesn't get transferred to the lower layers because water is a bad conductor. Also, the density of hotter water is less than that of cooler water. Hence hot water is always on top.

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