A mass of falling and tumbling rock, debris, and soil leveling at a high velocity owing to the presence of ice or water is a:

Answer: Debris avalanche.

Explanation: Debris avalanches or debris flows is the process in which landslides in shallow form which has a been formed with mixture of water. They have a rapid speed to travel in downward motion along a slope. The flow of mud also carries bushes, rocks, debris along with it in a slope.

The main cause of this process is due to the slopes that are steep, heavy rainfall or soil that is loose