- APES in a BOX: The Soil Profile
Summary-AVID Article Format
- Soil Profile: Cross-Section layers from soil to bedrock
- O Horizon: Surface layer of partially and completely decomposed organic plant residue
- A Horizon: The uppermost layer of soil (topsoil); decomposing organic material, most organisms live here
- B Horizon: Subsoil, Plant roots penetrate, but less organic material than A Horizon
- C Horizon: Parent material for soil; bedrock and weathered materials like rock to produce inorganic components of soil