Question

Ellen is investigating the properties of soil. She is collecting evidence that soil is composed of layers. She digs a deep hole into an area of soil and records her observations. Which of the following lists the layers of soil that Ellen observes from top to bottom?
A.
top soil, organic material, subsoil, bedrock

B.
organic material, top soil, subsoil, bedrock

C.
top soil,organic material, bedrock, subsoil

D.
organic material, top soil, bedrock, subsoil

Answer 1

B. Soil layers from top to bottom are organic material (O horizon), topsoil (A horizon), subsoil (B horizon), then bedrock/parent material (C/R horizon).