Amazing Facts

Why the oceans water is 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

The salinity (salt content) of ocean water
varies. The oceans and seas contain roughly 5 x 10 16 tons of salts.
One cubic foot of average sea water contains 2.2 pounds of salt.

The oceans are about 3.5% salt (by weight). Salinity is generally
reported in terms of parts per thousand (abbreviated o/oo), the number
of pounds of salt per 1,000 pounds of water; the average ocean salinity
is 35 o/oo.

The saltiest water is in the Red Sea and in the Persian Gulf, which
have a salinity of about 40 o/oo (due to very high evaporation rates
and low fresh water influx). The least salty seas are in the polar
regions, where both melting polar ice and a lot of rain dilute the

Related Tags: Water  Oceans  
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