The rocks were formed inside the Earth, under conditions different from those on the surface. The environmental conditions of the surface cause physical and chemical transformations in the rocks.
The weathering is the breakdown rocks of the earth 's surface being in contact with the atmosphere, hydrosphere and biosphere. The transport of these materials does not take place, because if there were, we would speak of erosion.
As a result of weathering, fragments of rocks of different sizes called clasts are obtained. These materials are deposited at the foot of the rocks from which they come, forming a debris.
There are three types of weathering: