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Oceans are big water bodies. Salinity is due to the presence of minerals in water.
There are different kinds of process that deeply affects the salinity of ocean water. Continental deflections, Coriolis Effect, convection current and also evaporation.
Salinity is defined as the total amount of solid material in grams contained in 1km of sea water and is expressed as part per thousand. Salinity affects physical property of ocean such as temperature, pressure, density, waves and currents.
In open ocean evaporation affects the salinity of the oceans, in closed oceans the lack of sunrays cause greater salinity levels.
Three factors are evaporation and freezing of sea water.
Evaporation leaves salt behind. So as ocean water decreases, the percentage of salt increases, increasing salinity. As evaporation increases, rainfall also increases, thus it decreasing the salinity of ocean water.
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salinity
You could increase the salinity of the ocean by adding salt or removing water (ie: by evaporation).