Note2-Origin of soil

Note2-Origin of soil - Topic I: Origin & Description of...

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Topic I: Origin & Description of Soil Particles and Minerals Text Chapter 2
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1. Geological Cycle The final weathering products are soils
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2. Destructional -Weathering Landscapes broken down by chemical & hysical processes & erosion physical processes & erosion Physical cludes temperature changes Chemical always in water includes temperature changes (freezing and thawing, thermal expansion), crystal growth, pressure, alternate wetting and dominates in warm or moist climates cludes hydration hydrolysis p, g drying, plant roots, burrowing animals most pronounced in cold and includes hydration, hydrolysis, oxidation, reduction, carbonation and exchange xamples : p dry climates causes disintegration of parent material and facilitates chemical examples : – oxidation of Fe to form limonite, deposited in joints, inhibits groundwater flow weathering – hydrolysis of feldspars to form clay (kaolin) - forms infill for joints
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2. Destructional -Weathering Landscapes broken down by chemical & hysical processes & erosion physical processes & erosion Physical cludes temperature changes Chemical always in water includes temperature changes (freezing and thawing, thermal expansion), crystal growth, pressure, alternate wetting and dominates in warm or moist climates cludes hydration hydrolysis p, g drying, plant roots, burrowing animals most pronounced in cold and includes hydration, hydrolysis, oxidation, reduction, carbonation and exchange xamples : p dry climates causes disintegration of parent material and facilitates chemical examples : – oxidation of Fe to form limonite, deposited in joints, inhibits groundwater flow weathering – hydrolysis of feldspars to form clay (kaolin) - forms infill for joints
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2. Weathering (cont.) Factors affect weathering Many factors can affect the weathering process such as Climate , Relief (topography), Organisms (biological reactions), features of Parent rocks (e.g., trength) and ime strength), and Time . CROPT Climate determines the amount of water and the temperature.
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3. Soil formation, transport and deposition esidual soil Residual soil – Weathered in place, retains structure of parent rock.
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Note2-Origin of soil - Topic I: Origin & Description of...

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