Category : 7th Class
Water is a chemical substance with the chemical formula H2O. A molecule of water contains one oxygen and two hydrogen atoms connected by covalent bonds. Water exists in nature in all the three states. Water exists as vapour in air, as liquid in rivers, sea and under the ground and as solid in the polar regions and as snow on the mountains. Water covers about three-fourth of the earth's surface. Only 2.5% of the water available on the earth is fresh water and suitable for drinking, rest is in the form of oceans as salty water.
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