The primary factors that influence ocean currents are solar heating, wind, gravity, and the Coriolis effect. A secondary factor is surface circulation. These factors work in conjunction to produce the currents. The solar heat expands the water, making it higher at the equator. This bulge is then pushed by the wind, and pulled at by gravity. The Coriolis effect from the rotation of the earth also spins the water during this process, finally opposite circular currents in the northern and southern hemispheres.
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