Give reasons:
Sea water does not freeze at 0°C.
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The presence of impurities in water lowers its freezing point. Sea water contains salt which lowers the freezing point of water. So sea water does not freeze at 0°C.
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It is difficult to cook in hills as compared to plains.
Ice floats on water.
Aquatic plants and animals survive in very cold regions.
Water is used in room coolers and hot water bags.