Science crossword homework

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