Soil & Earth's Crust

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Across
  1. 4. name for different layers of soil such as topsoil being A
  2. 5. term for the top lyer of earths crust
  3. 6. any soil that is more than 60 percent clay
  4. 8. the supercontinent the world used to be united in
Down
  1. 1. a factor in healthy soil made from rich organic matter
  2. 2. the term for the study of soil
  3. 3. a practice to help prevent soil from becoming depleted
  4. 7. the healiest type of soil