Question

Ocean currents are produced by

A.
volcanoes on the bottom of the ocean floor.

B.
differences in the number of organisms living at different depths.

C.
earthquakes on the bottom of the ocean floor.

D.
differences in the temperature of the water at different depths.

Answer 1

D. Differences in water temperature (and salinity) produce density differences that drive ocean currents (thermohaline circulation); wind and Earth's rotation also shape surface currents.