Three major types of soils differences caused mainly

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Three major types of soils Differences caused mainly by varying climates and compositions of rocks Pedalfar (Alfisol)—soil rick in iron oxides and aluminum-rich clays; tends to occur in  areas of relatively high rainfall, means lots of leaching (no soluble minerals in A  horizon); generally a fertile soil (Eastern US) Pedocal (aridisol)—soil rich in calcium carbonate; precipitates of calcite in B horizon;  found where climate is relatively dry and warm; generally less fertile than a pedalfer soil  (Western US) Laterite—generally a reddish color, intense chemical weathering, calcium carbonate  (calcite) and silica have been leached, leaves behind iron-rich clays and aluminum  oxides, found in warm, wet climates  12 Large groups of soils called orders Ultisols—strongly weathered soils, low in plant nutrients, clay accumulation, usually  moist (Delaware) Inceptisols—younger soils with weakly developed horizons, found in variety of  geographic settings Mollisols—nearly black surface horizon, rich in organic matter and plant nutrients, sub- humid to sub-arid grasslands
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