Answer the following question given this paragraph: 

Gravity can pull soil, mud, and rocks down cliffs and hillsides. This is called mass movement. The most destructive types of mass movement are landslides and mudslides. They occur suddenly and without warming. They engulf everything in their path.


Q: What is the term for when gravity pulls soil, mud, and rocks down cliffs and hillsides?

 Choices:

- mass pressure

- avalanche

- mass momentum

- mass movement

A:
mass movement
