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12.2

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Chapter 12.2 Second period only

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12.2

  1. 1. Weathering, Soil, and Erosion12.2 Soil
  2. 2. Know✤ soil ✤ soil profile✤ parent material ✤ soil horizon✤ residual soil ✤ topsoil✤ transported soils ✤ subsoil
  3. 3. Understand✤ Soil is made of weathered rock and organic material.✤ Climate and other factors affect the composition of soils.
  4. 4. Do✤ Explain how soil forms.✤ Describe soil composition and the factors that affect it.
  5. 5. A-horizonResidual Transported (topsoil) soil soil B-horizon C-horizon Parent Profile of material mature soils Soil Arctic Type Desert Temperate Tropical
  6. 6. Name four factors that affect soilcomposition. ✤ Time; parent material; topography; climate
  7. 7. 12.2 #1. Describe the difference between aresidual soil and a transported soil. ✤ 12.2 #1. Residual soils form from the bedrock beneath it. Transported soil forms from parent material that originated in a different location.
  8. 8. #2. Sketch a soil profile andlabel A-, B-, and C- horizons.Describe what you are likelyto find in each horizon.✤ #2. A-horizon- is likely to contain humus and sand.✤ B-horizon is likely to contain iron oxides, clay and soluble minerals such as calcium and magnesium.✤ C-horizon- is likely to contain slightly weathered parent material.
  9. 9. #3. What rock materials are found insoil? ✤ #3. Sand, silt, and clay
  10. 10. #4. How does the amount of rainfall appear to affectwhether a soil is a grassland or a forest soil? Explain yourthinking. ✤ #4. It takes more rain to support a forest than it does to support grassland, thus, forest soil exists where there is more rain.
  11. 11. #5. How do you think the type of soil found in aparticular region might affect the lives of people inthe region? ✤ #5. The type of soil affects how easily crops can be grown and thus how large a population can be supported by local food growth.

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