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Soil Erodibility
Soil erosion can be classified as natural soil erosion or accelerated erosion. Under normal climate conditions, and with natural ground cover, soil erosion can often balance out with the rate of soil production. This is called 'natural erosion', or 'geological erosion'. Natural soil erosion includes water erosion caused by rainfall and runoff of water, wind erosion, glacial erosion caused by flowing ice, stream erosion occurring during channelized water flow, coastal erosion caused by waves and tides, and erosion occurred by transportation. Erosion occurring at a rate that exceeds the rate of natural erosion is called accelerated erosion. Accelerated erosion can result from certain human land use practices such as surface mining, forestry, agriculture, and construction. Additional natural erosion processes, such as water erosion, are responsible for accelerated erosion of soil. Soil erosion in Korea is primarily caused by rainfall. This rain-splash erosion detaches earth materials from the surface by the impact of water striking the surface and by the force of surface runoff. Winderosion is found in coastal regions and highlands. The intensity and amount of rainfall, soil type, the length and steepness of slope determine the degree of soil erosion by rainfall.