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The downhill movement of rock or soil under the influence of gravity.

Mass movement is the downhill movement of rock or soil under gravity. Unlike weathering, it involves movement. Heavy rain can make cliff material saturated and heavier, increasing instability.

The downhill movement of rock or soil under gravity, including rockfalls, landslides and mudflows.

Other forms of mass movement include landslides, mudflows and rotational slips, in which material moves downhill along a curved surface.

The downhill movement of rock, soil or other material under gravity.

The downhill movement of rock or soil under gravity, including slides, slumps and rockfalls.

The movement of rock or soil downhill under the influence of gravity.

Mass movement transfers rock or soil downhill under gravity. A landscape can therefore change through a sequence: weathering supplies loose material, gravity moves it down a slope, and a river carries some of it away.

The downhill movement of rock, soil or debris under the influence of gravity.

The movement of rock, soil or other material downslope under the influence of gravity.

Mass movement is the downslope movement of rock, soil or other material under gravity. Unlike river transport, it does not require flowing water to carry the material, although water often helps trigger it.

The movement of material downslope under gravity, including rockfalls, slides and slumps.

Distinguish weathering in place from downhill mass movement and erosion by waves.

Distinguish weathering, which breaks down rock in place, from mass movement, which moves material downhill under gravity.

Keep weathering and mass movement distinct: weathering breaks rock down in place; mass movement carries material downhill under gravity.