Question

a city experiences a heavy rainfall. days later, when no rainwater is present, rock, debris, and soil fall down a steep hill. which type of mass movement does this describe? creep landslide mudflow slump

Explanation:

• Creep: It is a very slow, gradual movement of soil or rock particles down a slope. The description in the question is not slow, so this is incorrect.
• Landslide: A landslide is a mass movement where rock, debris, and soil move down a slope. In this case, after heavy rainfall (which can weaken the slope - material cohesion), even when the rainwater is gone, the mass (rock, debris, soil) moves down the steep hill, which fits the definition of a landslide.
• Mudflow: Mudflow requires a significant amount of water mixed with soil, mud, etc. to flow like a liquid. The question states that no rainwater is present at the time of the movement, so this is not a mudflow.
• Slump: Slump involves a large block of material moving along a curved surface. The description in the question does not mention a curved - surface movement of a large block, so this is incorrect.

Answer:

landslide