At area 1, a stream empties into the ocean. at area 2, precipitation enters the ocean in the form of rainfall. at area 3, evaporation takes place at the ocean’s surface. in which areas does the salinity of the ocean decrease?

The answer is area 3. Evaporation takes place at the ocean’s surface. Salinity is the measure of salt in water. To decrease salinity, the salt water must move to freshwater. Salinity in rivers, lakes, and the ocean is conceptually simple, but technically challenging to define and measure precisely.