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    • Map showing different levels of ocean salinity.
    Rights: The University of Waikato Te Whare Wānanga o Waikato Published 30 June 2010 Size: 780 KB Referencing Hub media

    Much of the open ocean has a salinity between 34 ppt and 36 ppt. Salinity is controlled by a balance between water removed by evaporation and freshwater added by rivers and rain.

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      Ocean salinity

      There are many chemicals in seawater that make it salty. Most of them get there from rivers carrying chemicals dissolved out of rock and soil. The main one is sodium chloride, often just called ...

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