The ocean gets all of its salts from igneous rocks from the Earth’s crust, weathering and erosion of mountains, and streams and rivers transporting materials out to sea. Some of the salt comes from the rocks and sediments below the ocean floor. Some also could have originated from underwater thermal vents.
Evaporation and precipitation effect the salinity of the sea. The salt content of the water doesn’t change as much as the water comes and goes from the sea.
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