The first oceans that formed on Earth some 4 billion years ago
contained little salt but were weakly acidic as a result of gases
released by volcanic activity. But today, as a result of dissolution
of minerals from the land and the seafloor, the oceans contain over
5.5 trillion tons (5 trillion tonnes) of salts from nearly 100 different
elements. The concentration of salts in the oceans is between
3.3 and 3.7 percent. Salinity is greater in warm, semienclosed seas
such as the Mediterranean and the Red Sea. The two main
components of ocean salts are sodium and chlorine, with smaller
amounts of magnesium, sulfur, calcium, and potassium. If the
oceans evaporated completely, salt residues would be equivalent
to a layer 150 ft (45 m) thick over the entire planet.
(출처 : Oceanology - The Secrets of the Sea Revealed (2020) DK - 112page)
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