Water is a chemical compound of hydrogen and oxygen, which has the chemical formula is H2O. With the storage of special goods (e.g. computer, hydrogen bonds, and anomaly of separate mass) water is a substance very important in many branches of science and life. 70% of the land area of the Earth is covered by water, but only 0.3% of the total amount of water on Earth is in the sources can exploit used as drinking water.
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