题目解析:
岩石崩塌比其他类型的岩石滑动更快,因为岩石在一层压缩空气中移动。 线索:The fastest type of slide is a rock avalanche, in which a mass of rock literally floats on air as it moves downslope. The high speed of a rock avalanche is the result of air becoming trapped and compressed beneath the falling mass of debris...