Wat is the meaning of avalanche???
Large rock avalanches (rockfalls) have dammed rivers and buried towns. They are commonly composed ofbedrock fragments a few centimetres (an inch or so) in diameter and include much soil and dust. Rock avalanches are thought to ride on a cushion of compressed air that allows them to travel long distances. Adebris avalanche usually occurs in unconsolidated earth materials when weakened by moisture.
Some snow avalanches develop during heavy snowstorms and slide while the snow is still falling, but more often they occur after the snow has accumulated at a give ...more