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

Options:
- erosion of sediment from a mountain range
- mass extinction of marine organisms
- formation of an ocean trench
- melting of polar ice caps

melting of polar ice caps