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What 2 layers make up the topsoil?

What 2 layers make up the topsoil?. Horizon O and horizon A make up topsoil. What layer is made up of partly weathered rock?. Horizon C is composed of partly weathered rock. How does material move from horizon A to horizon B?.

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What 2 layers make up the topsoil?

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  1. What 2 layers make up the topsoil?

  2. Horizon O and horizon A make up topsoil.

  3. What layer is made up of partly weathered rock?

  4. Horizon C is composed of partly weathered rock.

  5. How does material move from horizon A to horizon B?

  6. The process of leaching moves material from horizon A to horizon B.

  7. What do horizon A and horizon B have in common?

  8. Both horizon A and horizon B have decayed organic material called humus.

  9. Where does the material in horizon C come from?

  10. The partly weathered rock in horizon C comes from unweathered parent rock.

  11. What is the composition of horizon O?

  12. Horizon O is composed of leaf litter and other organic matieral.

  13. In what horizon is there very little organic material?

  14. Horizon C had very little organic material.

  15. What is the composition of horizon R?

  16. Horizon R is composed of unweathered parent material.

  17. How are horizon A and horizon C different?

  18. Horizon A is rich in organic material and horizon C has very little organic mateial.

  19. Why do plants grow well in horizon A?

  20. Plants grow well in horizon A because it is rich in organic material and nutrients.

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