Why do things erode?
From Wikipedia: Causes What causes erosion to be severe in some areas and minor elsewhere is a combination of many different things, including the amount and intensity of precipitation, the texture of the soil, the gradient of the slope, ground cover (from vegetation, rocks, etc.) and land use. The first factor, rain, is the agent for erosion, but the degree of erosion is governed by other factors. The first three factors can remain fairly constant over time. In general, given the same kind of vegetative cover, you expect areas with high-intensity precipitation, sandy or silty soils and steep slopes to be the most erosive. Soils with a greater proportion of clay that receive less intense precipitation and are on gentle slopes tend to erode less. But here, the impact of atmospheric sodium on erodibility of clay should be considered. The factor that is most subject to change is the amount and type of ground cover. When fires burn an area or when vegetation is removed as part of timber op
