Posted: 30 April 2001

Natural physical and chemical processes by which the soil and the rocks of the Earth's crust are continuously abraded and corroded. Most erosion results from the combined activity of several factors, such as heat, cold, gases, water, wind, gravity, and plant life. In some regions one of these may predominate, such as wind in arid areas. Erosion is grouped into two major divisions: geological erosion, which affects rocks as well as soil, and soil erosion."Erosion," Microsoft® Encarta® Online Encyclopedia 2001 © 1997-2001 Microsoft Corporation. All rights reserved.