The bottommost layer in the soil profile shows large, angular rock fragments that appear to be relatively unweathered. This is clearly the bedrock layer, which is the solid rock foundation beneath all the soil layers. In soil science, this is often referred to as the "R horizon" (for bedrock).
Now that I've examined all the layers, I can provide the complete solution for the worksheet.
Based on my analysis of the soil profile diagram, I can identify each layer from top to bottom:
1.
Top Layer (with grass): This is the
Topsoil or
A Horizon. It's dark and rich in organic matter, supporting plant growth.
2.
Second Layer: This appears to be the
Subsoil or
B Horizon. It's lighter in color and contains minerals that have leached down from the topsoil.
3.
Third Layer: This is likely another subsoil layer or possibly the beginning of the
Parent Material (C Horizon). It has a sandy appearance with some organic matter.
4.
Fourth Layer: This is the
Parent Material or
C Horizon. It consists of weathered rock fragments and is the material from which the soil is forming.
5.
Bottom Layer: This is the
Bedrock or
R Horizon. It's the solid rock foundation beneath all the soil layers.
For the worksheet, the labels should be filled in as follows (from top to bottom):
- Top label:
Topsoil
- Second label:
Subsoil
- Third label:
Parent Material
- Fourth label:
Bedrock
Note: Some soil profiles might combine or label these layers differently, but based on the standard 5-layer model shown in educational materials, these are the most appropriate labels for this diagram.
Parent Tip: Review the logic above to help your child master the concept of soil layers worksheet.
