Question

Clay particles in soil have the diameter of

• A. < 0.002 mm
• B. 0.02 - 0.002 mm
• C. 0.02 - 0.2 mm
• D. 2.0 - 0.20 mm

Hint:

Soil particle sizes (USDA):
- Clay: < 0.002 mm.
- Silt: 0.002 - 0.05 mm.
- Sand: 0.05 - 2.0 mm.
- Clay particles have the smallest diameter.

Answer 1

The Correct Option is A

Step 1: Understanding the Question:
This question tests knowledge of soil particle size classification.

Step 2: Detailed Explanation:
Clay particles in soil have a diameter of < 0.002 mm (A).
This is the USDA classification for clay particles.
Other particle sizes:
- Silt: 0.002 - 0.05 mm.
- Very fine sand: 0.05 - 0.10 mm.
- Fine sand: 0.10 - 0.25 mm.
Thus, clay particles are the smallest (< 0.002 mm).

Step 3: Final Answer:
Thus, clay particles have a diameter of < 0.002 mm, which corresponds to option (A).
[0.5cm]