Vibhinn desho ko vargikrit karne me visva bank dwara upyog kiya jane wala mukhya mandand kya hai
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Only the top layer of a lake or river freezes, un- derneath the frozen upper layer the water remains in its liquid form and does not freeze. Also, oxygen is trapped beneath the layer of ice. As a result, fish and other aquatic animals find it possible to live comfortably in the frozen lakes and ponds
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Vibhinn desho ko vargikrit karne me visva bank dwara upyog kiya jane wala mukhya mandand kya hai
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