Chemistry
Rivers and lakes do not freeze easily because:
- Water does not contain matter like air, carbon dioxide and other minerals.
- Water is a universal solvent.
- Water has a high specific heat capacity and ice has a high latent heat of fusion.
- River water is fresh water.
Water
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Answer
Water has a high specific heat capacity and ice has a high latent heat of fusion.
Reason — Rivers and lakes do not freeze easily because the specific latent heat of fusion of ice is sufficiently high (= 336 J g-1). The water in lakes and rivers will have to liberate a large quantity of heat to the surrounding before freezing. The layer of ice formed over the water surface, being a poor conductor of heat, will also prevent the loss of heat from the water of lake, hence the water does not freeze all at once
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