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All seas and oceans are salty. Those near the Equator tend to be slightly more salty.
Salt is dissolved from the Earth and transported in oceans/seas by rivers.
The world's oceans have a salinity of about 3.5%
All the oceans and seas of the world are a huge source of salty water.
Salt is dissolved from the Earth and transported in oceans/seas by rivers.
Salt is dissolved from the earth and transported by rivers in seas/oceans.
Salt is dissolved from the earth and transported by rivers in seas/oceans.
Salt is dissolved from the Earth and transported in oceans/seas by rivers.
Salt is dissolved from the Earth and transported by rivers in seas and oceans.
Salt is dissolved from the earth and transported by rivers in seas/oceans.
Salt is dissolved from the Earth and transported by rivers in seas and oceans.
The oceans and seas were not originally salty. Over a period of many millions of years, rainwater runoff leached salts out of the rocks and down into the oceans, where it gradually accumulated to the salinity we have now. The process is continuing, and in millions of years time the oceans and seas will be a little more salty than they are now.