Which describes the horizons in a soil profile?

Question

Horizon A is mineral deficient.
Horizon O forms from organic material.
Horizon B undergoes the least amount of change.
Horizon C is most affected by the soil formation process.

Answer 1

In a soil profile, the horizons are typically described as follows:

1. Horizon A (Topsoil): This horizon is usually rich in organic material and nutrients, making it the most productive layer. It may contain some mineral content but is not mineral deficient.

2. Horizon O: This horizon consists primarily of organic matter, such as decomposed leaves and other plant materials. So, this description is correct.

3. Horizon B (Subsoil): This layer often accumulates minerals leached from the upper layers and may undergo significant changes, such as clay accumulation, making it more altered than horizon C.

4. Horizon C: This horizon consists of weathered parent material. It is less affected by soil formation processes than horizons A and B.

From the options given, the statement that is correct is: Horizon O forms from organic material.

The other statements are incorrect as described.