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Weathering and soil Chemical weathering - Colorado School of Mines

Weathering and soil Chemical weathering - Colorado School of Mines

Soil vs. Regolith•

Soil vs. Regolith• Regolith = the layer of rock andmineral fragments at the Earth’ssurface.• Soil = a combination of mineraland organic matter, water, andair.–The portion of regolith that cansupport rooted plant growth.Soil Horizons• The most important characteristicsused to define soil horizons are:1. Color2. Texture3. Structure4. Organic Matter Content5. Moisture Content6

Soil Horizons - Color• Organics turn soil black to darkbrown• Ferric Iron turns the soil yellowbrownto red• Ferrous Iron turns soil dark greygreen•SiO 2 or CaCO 3 turns the soil lightgray to whiteCarbon richReduced (ferrous–Fe +2 ) iron richCaCO 3 rich7

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