Mass movement

Definition

Movement of a large mass of rock, soil and debris downward due to the pull of gravity.


These changes can happen suddenly (as in one minute the rock is there and the next it is gone, or it can happen slowly over time).

The causes

Gravity is constantly trying to pull rock and debris down the slope of a mountain

Slumps and rockslides

The process of a slump is the sliding of coherent rock material along a curved surface whole the process of a rockslide is the sliding of rock ,arterial down a mountain.

Debris flow and earthflow

Debris flow: the movement of a water-laden mass of loose mud, sand, soil, rock and debris down a slope


Earth flow: a flow of fine grained material that typically develops at the lower end of a slope