Mass movement is more likely to occur and be fastest if the slope (gradient) is steep.

A lahar is a mudflow that may follow a volcanic eruption.

Terracettes, tilted poles and broken fences are evidence of landslides.

A lahar and a bogburst are forms of a mudflow.

Heavy rainfall can lead to fast, wet forms of mass movement.

Soil creep is a slow and wet form of mass movement.

Human activities can also lead to mass movement.

The material that is moved by mass movement is called regolith.

Mass movement is a form of erosion.