What is soil erosion classes of erosion 1 geologic

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What is soil erosion? Classes of Erosion 1. Geologic erosion Erosion due to natural processes that are not affected by human activities ( e.g., erosion of mountains, cutting of valleys). Normal rates of geologic erosion are on the order of 0.2-0.5 Mg/ha/yr. 2. Accelerated erosion Increased erosion rates above geologic erosion rates due to human activities ( e.g., grazing and farming practices). Types of Erosion 1. Water Erosion - due to surface runoff Sheet or splash - relatively uniform erosion from the entire surface Rill - water concentrates and cuts small channels as it runs off the soil - cultivation will erased rills by filling channels Gully - cutting of deep channels that cannot be erased by normal cultivation Although gully erosion looks more catastrophic, far more total soil is lost by the less obvious sheet and rill erosion. Factors affecting a soil's water erodibility: a. Texture of topsoil - silt and very fine sand are most erodible b. Structure of topsoil c. Soil organic matter concentrations - increase soil structure and water infiltration d. Infiltration/permeability rate e.
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