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Soil Horizons Diagram (Grade 9)

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Soil Horizons Diagram

Use the soil horizons diagram to answer the questions below.
Soil Layers Without Text Labels
1. 
Layer A is the                    and consists mainly of                   .
  1. A-horizon; topsoil
  2. B-horizon; humus
  3. R-horizon; topsoil
  4. O-horizon; humus
2. 
Layer B is the                    and consists mainly of                   .
  1. A-horizon; topsoil
  2. B-horizon; humus
  3. C-horizon; topsoil
  4. O-horizon; humus
3. 
Layer C is the                           and consists mainly of                          .
  1. A-horizon; rock fragments
  2. B-horizon; subsoil
  3. C-horizon; rock fragments
  4. R-horizon; subsoil
4. 
Layer D is the                           and consists mainly of                          .
  1. B-horizon; bedrock
  2. C-horizon; rock fragments
  3. O-horizon; bedrock
  4. R-horizon; rock fragments
5. 
Layer E is the                           and consists mainly of                          .
  1. A-horizon; rock fragments
  2. C-horizon; bedrock
  3. O-horizon; rock fragments
  4. R-horizon; bedrock
6. 
This letter represents the layer of soil consisting of very decomposed organic matter mixed with minerals.
  1. A
  2. B
  3. C
  4. D
  5. E
7. 
The parent material for the soil shown in the diagram generates from which layer?
  1. A
  2. B
  3. C
  4. D
  5. E
8. 
Which letter represents the layer of soil that typically accumulates clay as well as fine organic material?
  1. A
  2. B
  3. C
  4. D
  5. E
9. 
Which letter represents the soil layer that tends to be the richest in organic materials?
  1. A
  2. B
  3. C
  4. D
  5. E
10. 
In some regions, the E-horizon or leached layer, accumulates light colored minerals from the downward peculation of water. The E-horizon would usually be located directly above which layer in the diagram?
  1. A
  2. B
  3. C
  4. D
  5. E

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