![Map showing different levels of ocean salinity.](http://static.sciencelearn.org.nz/images/images/000/000/766/full/Map-of-ocean-salinity_-_Science_Learning_Hub.jpg?1674164878)
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.
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.