12 Soil Orders
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Last updated 4:57 PM on 10/4/25
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12 Terms
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Alfisols
developed under forest regime
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Andisols
volcanoes; nutrient rich
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Aridisols
dry; very little horizon development
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Entisols
just beginning to form; no horizons
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Gelisols
cold temps; permafrost
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Histosols
seasonal wetness; non-fully decomposed organic matter; almost all O layer
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Inceptisols
little bit more developed than entisol
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Mollisols
prairie soils; large A horizon organic matter
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Oxisols
very weathered, organics have been moved out, wet warm tropical, iron oxides
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Spodosols
often found in acidic (pine) forests, slight organic A horizon, well developed E horizon
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Ultisols
humid areas, older
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Vertisols
inverted profile, shrinking and swelling clays
Note 
Flashcards (152)