D. deposition
1. The organic material in soil is
A. bedrock
B. feldspar
C. fertilizer
D. humus
2. Soil begins to form when the process of breaks down parent rock,
A. weathering
B. topography
C. soil horizons
D. deposition
3. A distinct layer of soil is called
A. soil horizon
B. humus
C profile. soil
D. topography
4. The Chorizon contains
A. humus with dark organic material
B. clay and little to no humus
C. partially weathers parent rock
D. less humus but contains many more minerals.
5. Why are the top layers of soil darker in color than the lower layers? Because they
A. contain less organic matter
B. are the parent rock
C.contain more arganic matter
D. are the pore space
6. The texture of a soil is determined by the soil particles'____.
A. chemical makeup
B. mass
C. shape
D. size​