Arrange the following soil horizon of a typical soil profile starting from top to bottom.
A. A horizon
B. B horizon
C. C horizon
D. O horizon
E. E horizon
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → D, A, E, B, C
A full soil profile runs O → A → E → B → C (and then R, the bedrock). The O horizon is the surface litter of undecomposed organic matter, and the A horizon below it is the dark topsoil rich in humus.
The E horizon is the pale eluvial layer from which clay, iron and aluminium have been leached; the B horizon is the illuvial zone where those materials accumulate; and the C horizon is the weathered parent material at the base.