erosion of sediment from a mountain range mass extinction of marine organisms formation of an ocean trench melting of polar ice caps
I gave my students this multiple choice question: Over geologic time, global mean sea level has varied significantly. Which change is most likely responsible for an increase in global mean sea level?

Only one answer is correct among these 4 choices:
- erosion of sediment from a mountain range
- mass extinction of marine organisms
- formation of an ocean trench
- melting of polar ice caps

Could you tell me which one is correct?

melting of polar ice caps