The variation in salinity of sea water depends on all the following factors except the

The variation in salinity of seawater depends on several factors, such as the rate of evaporation, the amount of freshwater supplied by rivers, and the rate of water mixing by ocean currents. However, the slope of the land does not affect the salinity of seawater. The slope of the land refers to the angle or incline of the land surface. This factor does not directly impact the salinity of seawater. Therefore, the answer is that the variation in salinity of seawater depends on all the factors mentioned except the slope of the land.