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The Changing Landscape

The Changing Landscape. Different types of soil Soil is made of four parts: 1) Sand 2) Silt 3)Clay 4)Humus. The Changing Landscape. Sand, Silt and Clay are inorganic. Sand is the largest particle in the soil. When you rub it, it feels rough. This is because it has sharp edges. .

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The Changing Landscape

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  1. The Changing Landscape

  2. Different types of soil Soil is made of four parts: 1) Sand 2) Silt 3)Clay 4)Humus The Changing Landscape

  3. Sand, Silt and Clay are inorganic. Sand is the largest particle in the soil. When you rub it, it feels rough. This is because it has sharp edges. The Changing Landscape

  4. Sand doesn’t hold many nutrients. Sand is good for drainage. The Changing Landscape

  5. Silt is a soil particle whose size is between sand and clay. Silt feels smooth and powdery. When wet it feels smooth but not sticky. The Changing Landscape

  6. Clay is the smallest of the particles. Clay is smooth when dry and stick when wet. Soils high in clay content are called heavy soils. The Changing Landscape

  7. Here is some red clay when its wet. The Changing Landscape

  8. Here is some clay we use to make pots. The Changing Landscape

  9. Clay can also hold lots of nutrients, but doesn’t let air and water through it well. Nutrients are food for living things. The Changing Landscape

  10. What is this? The Changing Landscape Clay

  11. What is this? The Changing Landscape Silt

  12. What is this? The Changing Landscape Sand

  13. If a particle of sand was the size of a basketball The Changing Landscape Sand

  14. Then silt would be the size of a baseball. The Changing Landscape Silt

  15. And clay would be the size of a golf ball. The Changing Landscape Clay

  16. Which is the biggest? The Changing Landscape

  17. So which is the biggest? The Changing Landscape

  18. Humus is organic matter. Organic means naturaland made from living things. It is made of decayed or dead plants and animals. Humus contains the most nutrients. The Changing Landscape

  19. Soil is classified by the amount of sand, silt, clay, and humus it contains. This is sandy soil. The Changing Landscape

  20. Sandy soil has the largest pieces. It also has a lot of air spaces between the pieces. The Changing Landscape

  21. Sandy soils have good drainages but they do not hold water and nutrients well. The Changing Landscape

  22. This is clay soil. The Changing Landscape

  23. Clay soil is heavy. It has few spaces between the pieces so drainage is not good. It holds nutrients well but doesn’t allow water and air to pass through. The Changing Landscape

  24. This is Loam soil. The Changing Landscape

  25. Loam soil has a lot of organic matter. It has a good mixture of sand, silt, clay and humus. It has good drainage and plenty of nutrients. The Changing Landscape

  26. So which soil is the best for growing plants? A. Sandy Soil B. Clay Soil C. Loam Soil The Changing Landscape

  27. Plants need air, water, and nutrients from soil. Loam has all of these things so it is the best for growing plants. The Changing Landscape

  28. Some plants use humus for nutrients. Small animals eat the plants and bigger animals eat the small animals. Humus is an important part of the food chain. The Changing Landscape

  29. Homework: complete the handout with a partner. Fill in the blanks using page 27, 28 and 29 The Changing Landscape

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