heat from Earth's core radiation from the Sun tidal effects of the Moon motion of tectonic plates
I gave my students this multiple choice question: What is the main energy source for deep ocean currents that move large volumes of water around the planet?

Only one answer is correct among these 4 choices:
- heat from Earth's core
- radiation from the Sun
- tidal effects of the Moon
- motion of tectonic plates

Could you tell me which one is correct?

radiation from the Sun