Given a scientific passage and an answer, generate a question for the given answer.
Q: Passage: 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. Answer: slump
A:
What type of mass movement is a sudden movement of large blocks of rock and soil down a slope?