a fall of rock off of a cliff or very steep outcrop.

The precipitous descent of a detached mass of rock from a cliff or steep slope

The relatively free falling of a newly detached segment of bedrock from a cliff or other steep slope.

rockfall occurs on all steep slopes. It is caused by other climbers or by the continual erosion of the rock on a mountainside resulting from freezing, thawing, and heavy rain; grazing animals; or enemy action.

The most rapid type of mass movement, in which rocks ranging from large masses to small fragments are loosened from the face of a cliff.

an extremely rapid, and potentially dangerous, downslope movement of earth materials

Falling, bouncing, and rolling of debris down slope.

Moving mass of rock fragments that has broken loose from an outcrop and cascaded down a slope.

Rapid fall of a detached piece of bedrock from a cliff or steep slope.

Rockfall refers to quantities of rock falling freely from a cliff face. It is commonly caused by undercutting, either from wave action or badly planned construction work cutting away too much at the slope. The pieces of rock collect at the bottom creating a talus or scree.