Do You know the Biogeochemical cycles?

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Across
  1. 2. One usuable form of nitrogen
  2. 8. By adding excess nitrates to bodies of water through agricultural runoff, we create ___________ __________________
  3. 11. Through combustion, cellular respiration, and _____________, carbon dioxide is released into the atmosphere.
  4. 12. By _________ we alter the hydraulic cycle by increasing surface runoff, flooding, and erosion.
  5. 13. By manufacturing fertilizer, humans alter this cycle.
  6. 14. This gas is a key component of nature’s thermostat, slight fluctuations can affect the climate of an area.
  7. 15. By some___________ practices and we alter the hydraulic cycle
  8. 18. 1. Which reservoir do the water, nitrogen, and carbon cycle all have in common?
  9. 19. We need this element for the building of proteins.
Down
  1. 1. The reversal of nitrification.
  2. 3. ________________ ions are a form of nitrogen which can be used by plants.
  3. 4. 2. A cycle of natural renewal of water quality.
  4. 5. This element is prevalent in proteins, vitamins, and DNA.
  5. 6. not only is this a carbon sink, but it also neutralizes acidic substances
  6. 7. Through hundreds of millions of years, carbon is compacted in this ecosystem to form coal.
  7. 9. Through nitrogen –fixing bacteria or ______________, nitrogen is fixed so plants can use them.
  8. 10. This reaction takes place when VOCs and NOx from cars react with sunlight in areas with lots of traffic.
  9. 15. A process in which plants absorb usable nitrogen
  10. 16. One reservoir of this cycle provides fossil fuels.
  11. 17. About ________ percent of the carbon dioxide in the atmosphere comes from human activities.