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Soil Horizons
ABCs of dirt
6
Environmental Studies
Undergraduate 3
08/27/2015
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Term
O
 Definition
organic layer
Term
A
 Definition
Mineral horizon layer near the surface composed of humidified organic matter mixed with mineral matter
Term
E
 Definition
Eluvial horizon mineral layer characterized by losses of silicate clay, iron and aluminum
Term
B
 Definition
Mineral layer with evidence of pedogenesis or illuviation (movement into the horizon)
Term
C
 Definition
The unweathered geologic material the soil formed in; shows little to no soil formation
Term
R
 Definition
hard bedrock
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