The puddles are covered with ice during the first morning frosts, but the surface of the lake remains unfrozen

The puddles are covered with ice during the first morning frosts, but the surface of the lake remains unfrozen. Explain the observed phenomenon

Water has a high heat capacity. Therefore, it is difficult to heat water, but the water cools down longer. The mass of water in the lake is much larger, and therefore it will take longer to cool.

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