Land and Soil ------Weidert

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Across
  1. 1. concentrated livestock areas where diseases can be transferred
  2. 3. insects that feed on nectar
  3. 7. material that kills insects
  4. 8. air temperature is typically higher in the city
  5. 9. animals that graze on ragelands
  6. 11. the process of seeds growing stems and roots
  7. 14. 6% of US land
  8. 15. removal of only mature or middle aged trees
  9. 16. forests that have never been cut
  10. 17. topsoil
  11. 18. more people living in a city than the infrastructure can support
  12. 24. subsoil
  13. 25. water and air can pass through
  14. 32. rapid spread of a city into adjoing suburbs and rural areas
  15. 34. 28% of US land
  16. 37. a guarantee of an adequate food supple for all people at all times
  17. 38. removal of all the trees in a forest
  18. 39. loss of more than 10% of soil productivity
  19. 42. top layer of soil with living organisms
  20. 46. large boom in crop yields due to new technology
  21. 47. pick-up, transport and drop-off of material from one place to another
  22. 48. undernourishment of individuals and livestock
  23. 49. 25% of US population
  24. 50. permanent rock or bedrock layer
  25. 51. organisms that have had their DNA altered to benefit the human race
  26. 53. fancy word for fish farming
  27. 57. can lead to resistance build up in pests
  28. 61. "power" provided by fossil fuel using machinery
  29. 62. any land not used for farming or timber
  30. 63. region that is not cultivated and not inhabited by humans
  31. 64. machinery made it possible for fewer people needed to work on the farm
  32. 65. physical or chemical breaking down of rocks
Down
  1. 2. buildup of salt in the soil
  2. 4. turning a slope into steps for farming
  3. 5. buses and train systems
  4. 6. reestablishment of trees in a forest
  5. 10. computerized geographic data
  6. 12. any living or once living cells
  7. 13. facilities such as roads, bridges and sewers
  8. 19. weathered rock layer of rock
  9. 20. process of clearing forest at a rate faster than it can grow back
  10. 21. depletion of vegetation due to too many animals
  11. 22. land in cities left in their natural conditions
  12. 23. 26% of US land
  13. 26. desertification in the midwest during the Great Depression
  14. 27. planting tall plants to help block the wind prventing erosion
  15. 28. alternating crops from season to season
  16. 29. policies used in designing a city
  17. 30. material that kills weeds
  18. 31. the mixing of different crops together
  19. 33. "power" provided by people and animals
  20. 35. occurs when soil gets compacted
  21. 36. breakdown of waste into simple molecules
  22. 40. leeching layer of soil
  23. 41. movement of people
  24. 43. 20% of US land
  25. 44. planting perpendicular to a hill's slope
  26. 45. 75% of US population
  27. 52. water and air cannot pass through
  28. 54. planting of a single crop
  29. 55. increase in density of people living in cities
  30. 56. forests that are planted and managed
  31. 58. smallest least permeable molecules in soil
  32. 59. 13% of US land
  33. 60. largest molecules found in soil