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Soil Forming Processes

Soil Forming Processes - 1 Soil Forming Processes SS 121...

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1 1 Soil Forming Processes SS 121 Moody 2 Soil Forming Processes Additions Water, organic matter, O 2 , CO 2 , new PM Transformations Decomposition of organic matter – Weathering Translocations – Eluviation – Illuviation Losses Soil (to erosion) – CO 2 , nitrogen Soluble salts 3 Erosion = removal of earth materials from surface by wind, water, gravity, glaciers Transport = movement of eroded particles Weathering = physical and chemical changes in minerals/rocks at Earth surface 4 Physical weathering = large particles Æ small particles (Disintegration) 5 Processes of physical weathering Hydraulic action, abrasion, collision 6 Ice (frost) wedging 7 Pressure release and exfoliation 8 Physical and biogeochemical weathering work together: Particles get smaller AND corners and edges round off 9 Root wedging 10 Biogeochemical weathering Dissolution of soluble minerals NaCl Æ Na + + Cl -
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2 • Hydration Fe 2 O 3 + H 2 O Æ 2FeOOH CaSO 4 + 2H 2 O Æ CaSO 4 .
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