Soils Exam

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Across
  1. 8. Nitrogen _______ takes nitrogen gas out of the air, usually through bacteria
  2. 9. The bacterium that initially turns nitrogen gas into more useable forms
  3. 11. Process that turns soil into sediment
  4. 15. The type of erosion that takes place naturally over long timescales
  5. 17. Roundworms that are very important soil predators
  6. 18. The distance over which wind can move unimpeded
  7. 19. Soil that is permanently frozen
  8. 22. The shape of the land
  9. 25. The industry that uses the most water
  10. 26. This type of soil has very deep distributions of SOM due it the depth of plant roots
  11. 27. Soil __________ incorporates infiltration capacity and structural stability
  12. 28. The size category of organisms that require a compound microscope to see
  13. 30. A small channel created by erosion that can be smoothed by tillage
  14. 31. The process that returns carbon dioxide to the atmosphere in the short-term loop
  15. 32. The study of the interactions among living organisms, geological features, and chemical processes
  16. 33. Arthropods that are one of the most important soil organisms
  17. 35. Start of both loops of the carbon cycle
  18. 36. Adding excess nutrients to a system
  19. 37. First step in erosion of soil by water
Down
  1. 1. Final step in erosion of soil by water
  2. 2. The process when a plant releases organic compounds that affect other plants
  3. 3. The labile carbon pool that can be easily decomposed
  4. 4. Rainfall ________ incorporates rain intensity and seasonality
  5. 5. The nutrient that can cause excessive acidification of the soil, sometimes through acid rain
  6. 6. Moles, gophers, and snakes fall into this category of soil organisms
  7. 7. Decomposed organic matter
  8. 10. Crop _______ is changing the crops that are grown a field each year
  9. 12. An organism that eats other organisms
  10. 13. The mixing of soil layers due to animal movements
  11. 14. A problem with plant nutrient deficiencies that results in yellowing leaves
  12. 16. Ecosystem services that maintain fundamental ecosystem processes, like nutrient cycling
  13. 20. Ecosystem services that moderate or control ecosystem processes
  14. 21. An oxidation reaction by bacteria
  15. 23. Second step in erosion of soil by water
  16. 24. The narrow region of soil immediately surrounding plant roots
  17. 28. Symbiotic fungi attached to plant roots
  18. 29. The nutrient cycle that doesn’t really involve the atmosphere
  19. 34. Wind _____ is the most important factor affecting wind erosion rates