The surface of a lake is frozen in severe winter, but the water at its bottom is still liquid. What is the reason ?
Options
(a)Ice is a bad conductor of heat
(b)Since the surface of the lake is at the same temperature as the air, no heat is lost
(c)The density of water is maximum at 4°C
(d)None of the statements (a), (b) and (c) given above is correct
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