Mass movement refers to the movement of regolith down slopes. It can range from extremely slow forms like soil creep, which is barely noticeable as it slowly moves soil down even gentle slopes, to very rapid landslides that can be triggered by erosion or construction and move soil quickly down cliffs or steep slopes, sometimes with devastating effects. Other forms of mass movement include bogbursts, mudflows, and avalanches, which involve saturated soil or snow rapidly flowing down slopes.

1. Mass movement
Mass movement is the movement of regolith down a slope. The speed of mass
movement ranges from extremely slow to extremely rapid.
Soil Creep
Soil creep
Soil creep is the slowest form of mass movement. Soil can creep slowly down even
the gentlest slopes. It happens so slow that it can rarely be noticed except for the
effect it can have on surface objects like trees and walls.

2. Trees affected by Soil Creep
Landslides
Landslides
Landslides are a very rapid form of mass movement, down a cliff or a very steep
slope. They are common in mountain areas and along coasts. Anything that
undercuts the base of the slope can trigger a landslide, such as sea erosion or road
building, sometimes with devastating effect.

3. A town affected by a Landslide
Other forms of mass movement
Bogbursts, Mudflows and Avalanches are other forms of mass
movement. Bogbursts are common on boggy, hilly slopes, while mudflows occur
when soil/regolith that is saturated flow rapidly down the slope. Avalanches occur
where heavy snowfall becomes unsettled in mountainous areas.
An Avalanche

4. A Bogburst
A Mudflow