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Why does water need conservation even th...

Why does water need conservation even though large oceans surround the land masses?

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Water is one of the most ususual natural compound found on earth and it is also very important constituent of life. It exists as snow, water and water vapour. Terrestrial life forms require fresh water for their existence and the fresh water is not available easily.
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NCERT EXEMPLAR-NATURAL RESOURCES -Natural Resources
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  9. There is mass mortality of fishes in a pond. What may be the reasons?

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