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Water in lakes and ponds do not freeze a...

Water in lakes and ponds do not freeze at once in cold countries. Give a reason in support of your answer.

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This is because the specific latent heat of fusion of ice is sufficiently high (336) so to freeze water in lakes and ponds , a large quantity of heat has to be withdrawn hence if freezes slowly.
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ICSE-SELF ASSESSMENT PAPER -3-SECTION-B
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