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Salt is a compound of sodium and chlorine (NaCl) that is an essential ingredient for human life. The human body has to maintain a saline solution in the blood in order to be healthy. If the level of salt is too high, death from extreme thirst can occur. On the other hand, if the level is too low, the body is unable to absorb water and death may occur. The oceans of the earth are all salty and contain a salt solution that is similar to that of the human body. This has led many to conclude that it is likely that life began in the sea.

Salt is a colorless crystalline substance that is brittle. Its chemical name is halide and its crystalline structure is ...

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