How many horizons are present in the soil profile ?

Options

A. two zones
B. only one zone
C. three zone
D. four-zones

Answer

To answer the question about how many horizons are present in the soil profile, we can break it down step by step:

### Step-by-Step Solution:

1. **Understanding Soil Profile**: A soil profile is a vertical section of the soil that shows different layers or horizons. Each horizon has distinct characteristics and composition.

2. **Identifying the Horizons**:
- **O Horizon**: This is the organic layer, primarily made up of decomposed organic matter. It is not always present in all soil types.
- **A Horizon**: Also known as the topsoil, this layer contains the maximum amount of humus and minerals. It has a high percentage of organic matter and is crucial for plant growth.
- **B Horizon**: Known as the subsoil, this layer accumulates minerals and nutrients leached from the upper layers. It is where rainwater percolates and supports soil formation through weathering processes.
- **C Horizon**: This layer consists of partially weathered rock and is the parent material from which soil forms. It is not completely formed soil.

3. **Counting the Horizons**: While the O horizon is sometimes absent, the main horizons that are consistently present in a soil profile are:
- A Horizon
- B Horizon
- C Horizon

4. **Conclusion**: Therefore, the main horizons present in a typical soil profile are three: A, B, and C. The O horizon may or may not be included depending on the specific soil type.

### Final Answer:
There are three main horizons present in the soil profile: A, B, and C.

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