Which of the following is not a factor affecting the movement of ocean currents?

The correct option is (d), differences in the rate of evaporation, which is not a factor affecting the movement of ocean currents. The movement of ocean currents is primarily driven by the following factors: - Planetary winds: These are the major driving force of ocean currents. The winds move the surface water, which in turn causes a movement of deeper water. - Differences in temperatures: The temperature of ocean water affects its density. Cold water is denser than warm water, so it sinks, while warm water rises. This movement of water, known as thermohaline circulation, drives the ocean currents. - Shape of the land mass: The shape and location of the land masses affect the direction and flow of ocean currents. For example, a narrow strait or passage can cause water to flow faster or slower depending on its shape and width. On the other hand, the rate of evaporation is not a significant factor affecting the movement of ocean currents. Evaporation is the process by which water changes from a liquid state to a gaseous state, and it primarily affects the water cycle on land rather than the ocean currents. Therefore, the correct answer is (d) differences in the rate of evaporation.