What is salt?

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Sodium chloride ( 1     2     3    4 ) or common salt is the chemical compound NaCl. Salt occurs naturally in many parts of the world as the mineral halite ( 1     2     3     4     5     6    7    8 ) and as mixed evaporites in salt lakes.  Seawater  ( 1   2 ) has lots of salt; it contains an average of 2.6% (by weight) NaCl, or 26 million metric tons per cubic kilometer (120 million short tons per cubic mile, an inexhaustible supply. Underground salt deposits are found in both bedded. sedimentary layers and domal ( 1    2 ) deposits.  Some salt is one the surface, the dried-up residue of ancient seas like the famed Bonneville Salt Flats in Utah.  Salt even arrives on earth from outer space.   Conversely, surface salt depositions and man-made saltworks can be seen from space.

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