Soil Horizons

O
organic layer
A
Mineral horizon layer near the surface composed of humidified organic matter mixed with mineral matter
E
Eluvial horizon mineral layer characterized by losses of silicate clay, iron and aluminum
B
Mineral layer with evidence of pedogenesis or illuviation (movement into the horizon)
C
The unweathered geologic material the soil formed in; shows little to no soil formation
R
hard bedrock