Seawater has lots of salt; it contains an average of 2.7% NaCl, or 78 million metric tons per cubic kilometer, an inexhaustible supply contains other dissolved solids salt represents about 77% of Underground salt deposits are found in both bedded. Sedimentary layers and domal deposits. Bonneville Salt Flats in Utah. Salt even arrives on earth from outer space in meteors and its presence on the planet Mars makes scientists.
