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What 2 layers make up the topsoil?

This text explores the layers that make up topsoil, specifically horizon O and A, which are rich in organic material known as humus. It discusses horizon C, which consists of partly weathered rock from unweathered parent rock, and horizon R, the unweathered base layer. The process of leaching is described as a means of material movement from horizon A to B. Additionally, it highlights the importance of horizon A for plant growth due to its nutrient-rich composition. Understanding these layers is essential for soil health and agriculture.

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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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