The size of the clay particle is less than

Options

A. 0.02 mm
B. 0.002 mm
C. 0.2 mm
D. `2.0` mm

Answer

To answer the question regarding the size of clay particles, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Soil Particle Sizes**:
- Soil particles are classified based on their size into different categories: clay, silt, and sand.

2. **Classification of Soil Particles**:
- **Clay**: The smallest soil particles.
- **Silt**: Larger than clay but smaller than sand.
- **Sand**: The largest among the three.

3. **Size of Clay Particles**:
- The diameter of clay particles is defined as being less than 0.002 mm.

4. **Comparison with Other Soil Particles**:
- Silt particles range from 0.002 mm to 0.05 mm.
- Sand particles range from 0.5 mm to 2 mm.
- Particles larger than 2 mm are classified as stones or gravels.

5. **Conclusion**:
- Therefore, the size of clay particles is less than 0.002 mm, making them the finest soil particles.

### Final Answer:
The size of the clay particle is less than 0.002 mm.

---