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:

To determine the mass movement:

• Creep: Slow, gradual movement (not sudden fall).
• Landslide: Sudden movement of rock, debris, soil down a slope (matches the description, even days after rain, as rain weakens the slope’s stability).
• Mudflow: Requires water (mud), but the event occurs when “no rainwater is present.”
• Slump: Rotational movement (usually along a curved surface, not just a steep hill fall).

Answer:

B. landslide