5. Salty water of sea and oceans--
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Salt in the ocean comes from two sources: runoff from the land and openings in the seafloor. Rocks on land are the major source of salts dissolved in seawater. Rainwater that falls on land is slightly acidic, so it erodes rocks. ... The heated water is released through vents in the seafloor, carrying the metals with it.
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Salt in the sea, or ocean salinity, is mainly caused by rain washing mineral ions from the land into water. Carbon dioxide in the air dissolves into rainwater, making it slightly acidic. ... Underwater volcanoes and hydrothermal vents on the seabed can also release salts into the ocean.
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