Why are the Oceans
Salty?
As water flows in rivers, it picks up small amounts of mineral salts from the
rocks and soil of the river beds. This very-slightly salty water flows into the
oceans and seas. The water in the oceans only leaves by evaporating (and the
freezing of polar ice), but the salt remains dissolved in the ocean - it does
not evaporate. So the remaining water gets saltier and saltier as time passes.
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