Amass wasting process that involves rapid down-slope movement of debris aided by a cushion of air is called a slump a rock avalanche a rock fall a rock slide

The blank can be filled with the suitable option which is Rock Avalanche.

Explanation:

Rock Avalanche can be defined as common process of movement of mass down the slope rapidly where the material which is transported down-slope is a large dry rock or low temperature fragmented ice which after sliding down breaks into small fragments

answerpeople organize large projects such as levee-building;

answer (a) more rain in u s and less rain in australia and asia