Which force is responsible for waves and surface currents?
a. heat
b. friction
c. gravity
d. pressure

Ocean tides are caused by the gravitation of the Moon. Currents can be formed by the flow of tidal water around the continental plates, or by a difference in water temperature between large ocean areas. Surface waves are caused by the wind. Abnormal waves can be created by the tectonic movement of plates around and under the ocean floor (tsunamis). So as you can see, the answer is (C) Gravity

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