Definition: Given a scientific passage and an answer, generate a question for the given answer.
Input: Passage: Creep is the very slow movement of rock and soil down a hillside. Creep occurs so slowly you can't see it happening. You can only see the effects of creep after years of movement ( Figure below ). The slowly moving ground causes trees, fence posts, and other structures on the surface to tilt downhill. Answer: creep
Output:
What is the apt term for the very slow movement of rock and soil down a hillside?