The O horizon
A)is the area of maximum deposition of nutrients as a result of illuviation.
B)contains intact and decomposing organic material.
C)is composed of very large soil particles.
D)is often referred to as topsoil.

Question

Quizplus · Accepted Answer

The O horizon is composed of organic material, both intact and decomposing, such as leaves, twigs, and dead organisms. It is the top layer of soil and is often referred to as "leaf litter". The area of maximum deposition of nutrients as a result of illuviation occurs in the B horizon. The O horizon does not contain very large soil particles, as it consists of organic material that is broken down into smaller pieces. While the O horizon is the top layer of soil, it is not referred to as "topsoil" as topsoil refers to a combination of soil layers that are ideal for plant growth.

The O Horizon