A student makes a list of all the soil layers in a temperate region. Which layer would be located farthest from the surface of the Earth? organic layer (O)

Question

organic layer (O)

parent material (C)
parent material (C)

topsoil (A)
topsoil (A)

bedrock (R)

Answer 1

In a typical soil profile, the layer that is located farthest from the surface of the Earth is the bedrock (R) layer. The order of soil layers from the surface downward is generally as follows:

1. Organic layer (O) - the top layer, rich in organic matter such as decomposed leaves and other plant materials.
2. Topsoil (A) - the layer beneath the organic layer, containing a mix of organic material and minerals.
3. Parent material (C) - consists of weathered rock and material from which soil develops.
4. Bedrock (R) - the solid rock layer located at the bottom, which is the source of the minerals in the soil above.

So, the bedrock (R) layer is the layer that is farthest from the surface.