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O-horizon is...

O-horizon is

A

Top soil

B

Sub-soil

C

Organic layer

D

Solum.

Text Solution

AI Generated Solution

The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding Soil Horizons**: Soil is composed of various layers known as horizons. Each horizon has distinct characteristics and composition. The main horizons typically include O, A, E, B, C, and R. 2. **Identifying the O-Horizon**: The O-horizon, also known as the organic horizon, is the topmost layer of soil. It is primarily composed of organic matter. 3. **Composition of the O-Horizon**: This layer contains decomposing materials such as leaves, plant parts, and animal remains. The presence of humus, which is a dark organic material formed from the decomposition of plant and animal matter, is a key feature of the O-horizon. 4. **Thickness of the O-Horizon**: The thickness of the O-horizon can vary. In some soils, it may be quite thin, while in others, it can be relatively thick. However, it may not be present in all soil types. 5. **Conclusion**: Based on the characteristics and composition discussed, the O-horizon is best defined as the organic layer of soil. **Final Answer**: The O-horizon is the organic layer. ---
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