Question
Which describes the horizons in a soil profile?
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.
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.
Answers
GPT-4o mini
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.
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.