High salinity levels in seas can come from three sources, genrally. Chemical erosion of the sea floor, where minerals from the bedrock are brought into the ocean water can cause saline levels to rise. Runoffs from surface sources, such as pollutants in streams, can also add disolved ions to sea water. And evaporation which results in the fresh water concentration being reduced.
High salinity can be caused by evaporation mainly in areas that do not receive a lot of rain. These areas are most likely to experience large amounts of dry wind. This cause water to evaporate and leave salt behind in the oceans. Areas that have high salinity due to evaporation are the Mediterranean Sea and the Atlantic (north and south).
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