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What 2 layers make up the topsoil?. Horizon O and horizon A make up topsoil.

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Presentation on theme: "What 2 layers make up the topsoil?. Horizon O and horizon A make up topsoil."— Presentation transcript:

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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