Soil erosion is the washing or blowing away of the top layer of soil by water or wind. There are two main types of soil erosion: geological erosion and accelerated erosion. Geological erosion is a natural process caused by factors like rainfall, runoff, wind, and topography. Accelerated erosion is caused by human activities that damage natural soil cover and conditions, such as deforestation, lack of conservation practices, and construction. Water erosion occurs through processes like splash erosion, sheet erosion, rill erosion, gully erosion, and erosion of river banks, reservoirs, and coastal areas.