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Water is the base of the life, the life was born in water. Water is present everywhere on Earth but according to several forms. In the air in the form of vapor, liquid or solid on ground. Water is rare for 95 % of water are chemically confined in the rocks and cannot be used by the man. Only 5 %, which constitutes the cycle of water, are mobilizable for the life on Earth. 97,4 % of the water reserves usable are salted. The fresh water represents only 2,6 % of these reserves, but only 0,6 % are mobilizable. It is of the steam contained in the atmosphere, of underground water, the moisture of the ground and surface water. |
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