Exploring Soil Layers
A worksheet for 4th graders to learn about the different layers of soil, their characteristics, and importance.
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Exploring Soil Layers
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Read each question carefully and answer to the best of your ability. Some questions may require you to look at the diagram.
1. Which layer of soil is usually the darkest and contains the most humus?
Bedrock
Topsoil
Subsoil
Parent Material
2. What is the main role of the topsoil layer?
To hold large rocks
To support plant growth
To store water permanently
To prevent erosion
3. The decayed organic matter in soil is called .
4. The layer of solid rock beneath all the soil layers is called .
5. Water drains through the layer to reach the subsoil.
6. Humus makes the soil less fertile.
True
False
7. The parent material layer is made of weathered rock.
True
False
8. Why is topsoil important for plants?
9. Describe one difference between subsoil and topsoil.
Use the words below to complete the sentences.
10. The layer rich in nutrients from decaying plants and animals is called .
11. Roots often reach into the layer, which has less organic matter but more minerals.