landslides moving loose rocks downhill sediments depositing on the seafloor deltas forming at the mouth of rivers mountains building up
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which process is the best example of a sudden change to Earth's surface?
Possibilities:
- landslides moving loose rocks downhill
- sediments depositing on the seafloor
- deltas forming at the mouth of rivers
- mountains building up

landslides moving loose rocks downhill