Soil

123456789101112131415161718
Across
  1. 3. A complex mixture of minerals, water, gases and remains of dead organisms
  2. 4. The layer of soil which contains organic material and small rock material
  3. 5. One factor that causes soil profiles to be different in different areas of the world
  4. 7. The transformation of land once suitable for agriculture into desert
  5. 12. What percent of the earth's surface is covered by soil
  6. 15. Type of soil that has the smallest particles
  7. 16. Planting one crop one year and a different type of crop the following year
  8. 17. Type of soil that is most fertile
  9. 18. Name given to the layers in the soil profile
Down
  1. 1. Method of farming where you plow across a slope following its contour lines
  2. 2. Over time, this process moves rock from the bottome layer to the top layer
  3. 6. The bottom, solid layer of rock
  4. 8. Occurs when wind and water strip the soil from an area
  5. 9. Farming method that involves building step-like ridges on sloping land
  6. 10. One type of soil pollution caused when contaminants combine with moisture (two words no space)
  7. 11. number of years it takes to form a thin layer of soil (two words no space)
  8. 13. Vertical view of the soil which shows the different layers
  9. 14. Type of soil that is coarse and drains quickly
  10. 17. Materials in the soil are classified according to the ____ of their particles