Which of the following statements about surface currents is correct?
surface currents are created by wind and changes in salinity.
surface currents are created by wind and the earth's rotation.
surface currents are created by the earth's rotation and changes in temperature.
surface currents are created by changes in temperature and changes in salinity.

The answer is:Surface currents are created by the Earth's rotation and changes in temperature.
Ocean currents has two major types of currents, surface currents and deep currents. Ocean currents can be generated by a lot of factors. These factors include:  
-wind;
-density differences in water masses caused by temperature and salinity;
-variations;
-gravity; and,
-events such as earthquakes.