Rockfall - The term for the sudden, rapid downward movement of a mass of rock and soil along a well-defined surface of rupture?, Mudslide - The term for the downslope movement of a mixture of water, rock, and soil, often occurring in mountainous regions after heavy rain, Mass Movement - Is when rocks, dirt, and debris slide down a hill or slope due to gravity, Gravity - Which force is responsible for moving sediment downhill due to the pull of gravity?,

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