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Across
  1. 1. difference in elevation
  2. 2. solid layer beneath soil
  3. 4. line that shows elevation on a topographic map
  4. 5. dark colored organic materials in soil
  5. 7. chemical/ physical process that breaks down rocks
  6. 10. when a substance combines with oxygen and forms rust
  7. 13. crops are left on soil from previous years; type of plowing
  8. 17. plowing fields along slope curves to prevent soil loss
  9. 18. rich soil made up of clay sand and silt
  10. 20. grinding away of rock
  11. 21. top layer of soil
  12. 22. a thick mass of grass roots and soil
  13. 23. loose layer of dead plant leaves and stems on the surface of soil
  14. 24. splits rock when water goes in cracks and freezes
  15. 26. loose material where plants can grow
  16. 27. area in Great Plains where erosion caused soil loss in the 1930's
  17. 28. how well soil supports plant growth
Down
  1. 1. process that uses chemical processes to break down rock
  2. 3. map that shows elevation
  3. 6. layer of soil beneath topsoil
  4. 8. geological principle; same processes that happened before happen now
  5. 9. darker or bolder contour line
  6. 11. planting f different crops in area of a field to keep soil fertility
  7. 12. type of weathering; rock is physically broken
  8. 14. management of soil to prevent destruction
  9. 15. anything in the environment humans use
  10. 16. layor of soil that differs from layers above and below it
  11. 19. characteristic; spaces that water can seep through
  12. 25. organisms that decompose soil
  13. 29. ice wind water and gravity moves rock