Soil horizons and erosion (article) | Khan Academy
https://www.khanacademy.org/science/ap-college-environmental-science/x0b0e430a38ebd23f:earth-systems-and-resources/x0b0e430a38ebd23f:earths-soil/a/soil-horizons-and-erosion
WEBSoil profiles can help distinguish soil types, and can also be used to predict soil fertility. The generalized soil profile below includes four major soil horizons: O, A, B, and C: The O horizon, or organic horizon, is made up mostly of organic matter such as leaf litter and decomposed plant material.
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