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Answer- c Explanation: Water is an unusual substance because its maximum density occurs at 4 degrees Celsius. As water cools below 4 degrees Celsius, it starts to expand and becomes less dense. When the temperature drops further, water freezes into ice. The less dense ice then floats on the denser liquid water. In the context of the frozen lake scenario, the surface of the lake freezes because the colder air causes the water at the surface to lose heat and freeze. However, the bottom of the lake, where the water is still liquid, is insulated by the ice layer above. The ice acts as a thermal insulator, preventing further heat loss from the liquid water below. This phenomenon allows the water at the bottom of the lake to remain in a liquid state even in severe winter conditions. Hence option c is the correct.