What is soil erosion? Erosion can be defined as the removal of soil particles by the movement of wind or water. Soil erosion is considered one of the major agricultural concerns around the world today. Improper use of land, mismanagement of agricultural land, felling of trees, overgrazing, poor soil and water management are all practices that contribute to soil erosion. Erosion can cause a decline in soil fertility, water supplies and crop yields. In this way it affects the productivity of the land and decreases the production of food, feed, fiber and fuel ("Causes of soil erosion", 1987). Erosion can negatively affect the socio-economic conditions of the state. Causes of Erosion Erosion causes floods, siltation of water reservoirs, disruption of communication systems and disturbance of the socio-economic structure of the agricultural community. Erosion can be classified into two parts: normal, or geological, erosion and accelerated erosion. ("Causes of Soil Erosion", 1987). With normal erosion, the effects are not visible on the earth's surface and soil productivity is not negatively affected. The amount of soil lost due to this type of erosion is equal to the amount of soil formed. With accelerated erosion, however, the effects of erosion are visible on the ground surface and the rate of soil loss is greater than the rate of soil formation (“Soil erosion-cause,” 1987). Erosion agencies: wind and water Erosion is mainly caused by two agents: wind and water. These two processes are always active all over the world. There are four stages of water erosion: (1) raindrop or splash erosion, (2) sheet erosion, (3) stream erosion, and (4) gully erosion ("soil erosion... half of paper... ....php?id=1Dickson, Despommier. (2009). The rise of vertical farms. Scientific American, 301(5).Dingfelder, Jackie (2010). Bioscience, 59(3), doi: 10.1525/bio.2009.59.3.8.Li, Feng-Rui, Zhao, Wen-Zhi, Liu, Ji-Liang and Huang, Zhi-Gang (2009). Wind erosion affects soil carbon, nitrogen, and phosphorus accumulation in sandy grasslands, Plant & Soil, 317(1/2), doi: 10.1007/s11104-008-9789-8.Miller, G., & Spoolman, Scott . (2009). Environmental Science. Brooks/Cole Pub Co. Okin, Gregory, Parsons, Anthony, Wainwright, John, Herrick, Jeffery and Peters (2009). .omafra.gov.on.ca/english/engineer/facts/12-053.htm).