6. Rockfalls commonly occur on steep cliffs and produce cone -shaped piles of debris called __ 7. To reduce the risks of mass movements , steep slopes can be stabilized using materials such as __ nets or __ walls.

6. Rockfalls are a type of mass wasting that occurs when rocks fall from a cliff face. The debris that accumulates at the base of the cliff often forms a cone-shaped pile known as a "talus". This is due to the angular nature of the rocks and the way they accumulate.<br />7. To reduce the risks of mass movements, which are the downslope movement of rock, debris, or earth, steep slopes can be stabilized using various methods. One common method is the use of "sloping" which involves cutting back the slope to a safe angle. Another method is the use of "retaining" walls which are structures that hold or retain soil behind them. Additionally, "geogrids" are geosynthetic materials that can be used to reinforce slopes. "Nets" can also be used to catch falling debris and prevent it from causing damage or injury.