Slide 1

What 2 layers make up the topsoil? Slide 2 Horizon O and horizon A make up topsoil. Slide 3 What layer is made up of partly weathered rock? Slide 4 Horizon C is composed of partly weathered rock. Slide 5 How does material move from horizon A to horizon B? Slide 6 The process of leaching moves material from horizon A to horizon B. Slide 7 What do horizon A and horizon B have in common? Slide 8 Both horizon A and horizon B have decayed organic material called humus. Slide 9 Where does the material in horizon C come from? Slide 10 The partly weathered rock in horizon C comes from unweathered parent rock. Slide 11 What is the composition of horizon O? Slide 12 Horizon O is composed of leaf litter and other organic matieral. Slide 13 In what horizon is there very little organic material? Slide 14 Horizon C had very little organic material. Slide 15 What is the composition of horizon R? Slide 16 Horizon R is composed of unweathered parent material. Slide 17 How are horizon A and horizon C different? Slide 18 Horizon A is rich in organic material and horizon C has very little organic mateial. Slide 19 Why do plants grow well in horizon A? Slide 20 Plants grow well in horizon A because it is rich in organic material and nutrients.