Scientific theories about salt in the sea started around 1715 when Edmond Halley suggested that the salt was brought into the ocean by rivers after rainfalls, which is only partially true. In addition, sodium leached out of the ocean floor when the oceans were formed and chloride outgasses with other gases from the Earth´s interior via volcanos and hydrochloric acid. (These two are the main constituents of sea salt). One theory is that plate tectonics force salt under the continental land masses, where it slowly leaches to the surface.
Because the water course, coming down towards the sea, removes small mineral amount that then deposits on ocean's founds.
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