As the cracks get bigger and bigger, pieces of rock break off. Cracks in the rocks let air and water in. Weathering then goes on inside the rocks as well as on the outside. Water begins its eroding and dissolving action. If freezing occurs, the expansion of the water exerts tremendous pressure this causes the rock mass to break into smaller pieces.
Erosion is the wearing away and removal of soil and rock fragments by wind, ice, and water.
Winds rank high among the important forces of weather that shape the surface of the earth. Winds erode rock and soil, transport the eroded material over vast areas and deposit them upon the earth. In this way, they level land here, build it up there, and scoop out hollows elsewhere. You would probably think the stronger the wind, the more effective it would be as an agent of erosion, transportation and deposition. This is not the case.