Science crossword homework

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Across
  1. 3. the top layer of soil
  2. 4. fertile soil
  3. 7. layer of dead organic material
  4. 9. change of set contour lines
  5. 10. physical weathering
  6. 12. process that breaks down rock
  7. 13. the layers of different soil
  8. 15. map that uses line to show elevations
  9. 17. the heavier contour lines
  10. 21. anything in nature that humans use
  11. 22. In the Great Plains in 1930's the _______caused soil soil
  12. 23. preserving soil
  13. 24. the solid layer of rock under earths surface
  14. 25. the process of rock removal with chemicals
  15. 28. mostly clay soil that is under the topsoil
  16. 29. how we'll soil supports growth
Down
  1. 1. lines on a topographic map
  2. 2. plowing on the curves to prevent soil loss
  3. 5. when rock particles change the shape of a rock over time
  4. 6. dark organic material in soil
  5. 8. where crops are left to hold soil in place
  6. 11. the way earth has changed over time
  7. 14. I dug in the ____ to find worms.
  8. 16. a change when substances rusts
  9. 18. Worms are a type of _____.
  10. 19. planting different crops each year to increase fertility rate of the soil
  11. 20. tiny holes where water is able to seep through
  12. 23. thick mass of roots and soil
  13. 26. thawing and freezing of water I between two rocks
  14. 27. the movement of weathered rock