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9009861817O HorizonSurface litter: fallen leaves and partially decomposed0
9009861818A HorizonTopsoil: organic matter (humus) living organisms, inorganic materials1
9009861819E horizonZone of leaching: dissolved or suspended materials move downward2
9009861820B HorizonSubsoil: accumulation of iron, aluminum, humic compounds, and clay leached from the A and E horizons3
9009861821C HorizonWeathered parent material: partially broken-down inorganic minerals4
9009861822R HorizonBedrock: impenetrable layer5
90164676995 soil forming factorsclimate, terrain, biologic activity, geology, time6
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