Because the process of evaporation leaves behind salt and rain is an result of evaporation
evaporation
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Three factors are evaporation and freezing of sea water.
evaporation
You could increase the salinity of the ocean by adding salt or removing water (ie: by evaporation).
In open ocean evaporation affects the salinity of the oceans, in closed oceans the lack of sunrays cause greater salinity levels.
What causes low salinity in the oceans at high latitudes?In subtropical latitudes, high surface evaporation creates high salinity near the sea surface. In subpolar latitudes, high precipitation creates low salinity near the sea surface. As these waters flow into the ocean interior, they create layers of high and low salinity.
The salinity of ocean water depends on its location, rate of evaporation, amount of precipitation and amount of freshwater added to the ocean.
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.
Salinity in the ocean is highest in regions where evaporation is high and precipitation is low. Density in seawater is determined by both temperature and salinity.
Salinity will be increased in the ocean when water evaporates and when it freezes.Ocean water.
Chitin.