Wind, water, gravity - Natural causes of erosion , Layer O - Made up of organic matter, Layer A - topsoil, contains humus , Biological Factors - microorganisms, plants, and animals. , topography - the shape/slope of the enviorment, Layer B - subsoil, more rock, less organic material. , Layer C - weathered parent material , Layer R - Bedrock (parent material), Anthropocentric - Erosion caused by human activities , Time, Climate, parent material, topography, biological factors. - Formation is affected by...,

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