Rockfall (noun)

1. A fall of rocks or boulders from a cliff, mountain, or other steep slope.
2. The action or process of rocks falling from a cliff, mountain, or other steep slope.

Origin:

From noun rock + fall.

Examples:

1. The rockfall was caused by a landslide.
2. The rockfall blocked the road, causing traffic to be diverted.
3. The rockfall was a danger to hikers in the area.
4. The rockfall was a result of heavy rainfall and erosion.
5. The rockfall was an impressive sight, as large boulders tumbled down the slope.