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. They generally have little warning before they happen. They engulf everything in their path. Two other types of mass movement are slump and creep. They usually  aren't as destructive as landslides and mudslides. Slump is the sudden movement of large blocks of rock and soil down a slope. Creep is the very slow movement of rock and soil down a slope. It causes trees, fence posts, and other structures to tilt downhill. 
question: What happens when landslides and mudslides occur?
answer: The are slow moving