What is the definition of eluviation?
A) Decayed organic material
B) Accumulation of fine clay particles in a soil column
C) Downward transportation of fine clay particles in a soil column
D) The collective term for the O, A, E, and B horizons
Question 2
________ are the primary source of organic matter in soils.
A) Earthworms
B) Microorganisms
C) Plants
D) Mammals