question_answer

Arrange the following layers of soil. Starting from the uppermost layer that is visible to us till the deepest layer.

A. Bedrock,               B. Topsail                C. Subsoil                  D. Humus

A) A, B, C, D                   

B) D, B, C, A     

C) D, C, B, A                   

D) B, A, D, C