Which force primarily generates most ocean surface waves?

Which force primarily generates most ocean surface waves?

• A. Tides
• B. Wind
• C. Internal currents
• D. Earth rotation

Answer: (B)

Energy is put into the sea surface mainly by wind. As air moves over the water, friction at the air–sea interface transfers energy to the surface, creating waves that grow with wind speed, duration, and fetch. Tides are caused by gravity from the Moon and Sun and produce slowly changing water levels with long periods, not the everyday surface waves you see. Internal currents exist below the surface and don’t drive the surface waves. Earth’s rotation affects how waves travel, not their initial generation. So the force that primarily generates most ocean surface waves is the wind.

Energy is put into the sea surface mainly by wind. As air moves over the water, friction at the air–sea interface transfers energy to the surface, creating waves that grow with wind speed, duration, and fetch. Tides are caused by gravity from the Moon and Sun and produce slowly changing water levels with long periods, not the everyday surface waves you see. Internal currents exist below the surface and don’t drive the surface waves. Earth’s rotation affects how waves travel, not their initial generation. So the force that primarily generates most ocean surface waves is the wind.