Which of the following soil horizon designations is in correct sequence from the surface to bedrock?
A) O, R, C, B, A
B) A, B, C, O, R
C) S, O, I, L
D) O, A, E, B, C, R

Question

Quizplus · Accepted Answer

This is the correct sequence of soil horizon designations from the surface to bedrock according to the USDA soil taxonomy system: O (organic matter), A (topsoil), E (eluviated or leached zone), B (subsoil), C (parent material), R (bedrock). Option A has R before C, Option B has O after C and R at second last, and Option C has unaccepted horizon designations.

Which of the Following Soil Horizon Designations Is in Correct