Question

Choose the option showing the correct arrangement of different layers of soil from top to bottom.

• A.
  
  Topsoil $\to$ Subsoil $\to$ Parent rock $\to$ Bedrock
• B.
  
  Subsoil $\to$ Bedrock $\to$ Topsoil $\to$ parent rock
• C.
  
  Bedrock $\to$ Topsoil $\to$ Subsoil $\to$ Parent rock
• D.
  
  Topsoil $\to$ Bedrock $\to$ Subsoil $\to$ Parent rock

Answer 1

The correct option is A


Topsoil $\to$ Subsoil $\to$ Parent rock $\to$ Bedrock

Topsoil is the topmost layer of the soil. It contains high proportion of humus alongwith nutrients.
Subsoil is the second layer of the soil that is present just below the topsoil. This layer has lesser amount of humus but more of minerals.
The third layer is the parent rock which is made up of small lumps of rocks with cracks and crevices.
Bedrock is the solid bottom most layer, mainly made up of rocks.
Thus, the correct arrangement of different layers of soil from top to bottom is as follows:
Topsoil $\to$ Subsoil $\to$ Parent rock $\to$ Bedrock