Question

Topsoil preservation in mine land reclamation is important because it

• A. Increases dump height
• B. Improves slope stability
• C. Reduces blasting cost
• D. Contains nutrients and microorganisms

Hint:

Topsoil is preserved during mine reclamation because it is rich in \[ \boxed{\text{Organic matter, nutrients, and microorganisms}.} \]

Answer 1

The Correct Option is D

Step 1: Recall the characteristics of topsoil. Topsoil is the uppermost fertile layer of soil containing organic matter, nutrients, seeds, and beneficial microorganisms.

Step 2: State its importance in reclamation. During mine reclamation, preserved topsoil promotes vegetation growth by supplying essential nutrients and microorganisms. Hence, \[ \boxed{\text{Contains nutrients and microorganisms}.} \] Therefore, \[ \boxed{(D)} \] is the correct answer.