Chapter 30, Problem 10RAT

The ultimate cause of ocean surface currents is

(a) divergence in equatorial regions.

(b) the gradient between the doldrums and the horse latitudes.

(c) density contrasts.

(d) frictional drag by prevailing winds.

To determine

The correct option for the statement “The ultimate cause of ocean surface currents is”.

Answer to Problem 10RAT

The correct option for the statement “The ultimate cause of ocean surface currents is” is option (d).

Explanation of Solution

The oceans are the large water bodies at our Earth. The ocean's water remains salty due to dissolved salts and biomaterials. The surface water of the oceans always moves continuously, and the movement of water is also known as surface current.

When the wind blows across the surface of the ocean, then the wind applies some drag force due to the friction between surface water and the air. This frictional drag force provides motion to the surface water in the same direction of the blowing wind. Thus, the reason behind the surface current is frictional drag by the prevailing wind.

Conclusion:

Therefore, the correct option for the statement “The ultimate cause of ocean surface currents is” is option (d).