Topsoil, the layer of soil where organic matter collects, is typically deep. a. 1 to 3 inches b. 2 to 8 inches c. 8 to 12 feet d. 2 to 8 feet

I believe the answer is B

Option (B)

Explanation:

The topsoil usually refers to the upper top portion of the soil. This portion is comprised of plant residues, smaller micro-organisms, decomposed matter and some amount of organic matter, which are not easily removed. Some amount of water and air also is present in this topsoil.

These particles together form the topsoil which enhances its fertility.

The thickness of these layers of topsoil usually ranges from 2-8 inches.

Thus, the correct answer is option (B).

seismic wave -

an elastic wave in the earth produced by an earthquake or other means.

explanation: