All seas have salt water because they have sand which has salt.
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Salt water accounts for 97.5% of all water on Earth. The oceans, seas and bays are salt water and represent 96.5% of all water on Earth. Another 1% exists as saline ground water. See related links.
About 97.5% of water on Earth is salt water and 2.5% fresh water.More:The total volume of water on Earth is estimated at 1.386 billion km³ (333 million cubic miles).About 97.5% of water on Earth is salt water and 2.5% fresh water.Of the 2.5% fresh water, only 0.3% is in liquid form on the surface.A breakdown of the various forms of water is as follows, going from the largest to the smallest.96.5000% Oceans, Seas, bays1.7400% Ice caps, glaciers, snow0.9400% Saline Groundwater0.7600% Fresh groundwater0.0220% Ground ice and permafrost0.0070% Fresh Lakes0.0060% Saline Lakes0.0010% Soil moisture0.0010% Atmosphere0.0008% Swamps0.0002% Rivers0.0001% BiologicalSee attached links for the sources of this information.
the dead sea was once a 'normal' sea like the rest, but evapoation made a higher percentage of water disappear than normal seas so when that happens the salinity of the water increases the way the dead sea has gone. Its not that salt has been added from a mysterious source, it that water has been taken away.
Salt water (in the form of oceans, seas and straits).
Smaller bodies of salt water usually surrounded by land are called seas. An example would be the Dead Sea between Israel and Jordan.