C. Wind
Surface ocean currents are caused by the different patterns of the wind. Because of the earth’s rotation, wind doesn’t simply circulate in a back and forth motion but it moves in varying directions in the Northern and Southern hemispheres. These deflected wind movements result in a curved pathway. This is called the Coriolis Effect.
Surface ocean current form gyres or large circular patterns. Because of the Coriolis Effect, gyres flow differently depending on which hemisphere they are on. Those who are on the Northern hemisphere move clockwise, while those in the Southern hemisphere circulate counter clockwise.
