surface winds. radiant heat from stars. Earth's tilt on its axis. the Moon's gravitational pull.
I gave my students this multiple choice question: Ocean tides result mainly from

Only one answer is correct among these 4 choices:
- surface winds.
- radiant heat from stars.
- Earth's tilt on its axis.
- the Moon's gravitational pull.

Could you tell me which one is correct?

the Moon's gravitational pull.