a large glacier forming on a mountain strong winds wearing away a rock cliff a major earthquake happening in a mountain range many waves on a lake moving pebbles onto a beach
I gave my students this multiple choice question: Which process causes the fastest changes to the surface of Earth?

Only one answer is correct among these 4 choices:
- a large glacier forming on a mountain
- strong winds wearing away a rock cliff
- a major earthquake happening in a mountain range
- many waves on a lake moving pebbles onto a beach

Could you tell me which one is correct?

a major earthquake happening in a mountain range