Biogeochemical Cycles

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Across
  1. 3. Dissolved CO2 in water is compacted into sediments to form rock (limestone)
  2. 7. Loss of excess water from land plants
  3. 11. Burning fossil fuels and other organic materials
  4. 13. Bacteria convert ammonia or ammonium into nitrates
  5. 17. Breaking down and transporting solid materials (usually rocks/soil)
  6. 19. Bacteria convert nitrates to atmospheric nitrogen
  7. 20. Phase change from water vapor to liquid water
  8. 21. Rain, snow, sleet, or hail
  9. 22. Animal waste returns organic nitrogen and phosphorous to the soil
Down
  1. 1. Phase change from liquid water to water vapor
  2. 2. Animals eat plants and other organic materials containing nitrates and phosphates
  3. 4. Plants using CO2 and light energy to produce O2 and food
  4. 5. Humans remove phosphates from under the ground for fertilizers
  5. 6. Processes that absorb the chemical (C, N, H2O, P) AKA reservoirs
  6. 8. Processes that release the chemical (C, N, H2O, P)
  7. 9. Organic material breaks down, returning organic carbon and phosphates to the soil
  8. 10. Living organisms using O2 and food to produce CO2 and energy
  9. 12. Exposing underground rocks with phosphorous to the surface
  10. 14. Bacteria or legumes convert atmospheric nitrogen into the more-usable ammonia
  11. 15. Bacteria convert organic nitrogen into ammonia during decomposition
  12. 16. Water filtering through the pore spaces in soil or rock
  13. 18. Water flowing downhill