Biogeochemical Cycles

1234567891011121314151617181920
Across
  1. 2. Burning of fossil fuels
  2. 3. Gas produced by photosynthesis
  3. 5. A place that releases carbon
  4. 9. Early microbes that produced oxygen
  5. 11. Plants use this process to absorb carbon
  6. 12. Nitrogen loss from soil into water
  7. 13. A place that stores carbon
  8. 15. Element that is the basis of all life
  9. 17. Long-term carbon store humans burn for energy
  10. 18. Human-made source of nitrogen
  11. 19. Organisms release carbon through this process
  12. 20. Nutrient needed by plants and animals
Down
  1. 1. Breaks down dead things, releasing carbon
  2. 4. Turns nitrogen gas into a usable form
  3. 6. Large carbon sink affected by acidification
  4. 7. A repeating system of movement or change
  5. 8. Process that uses oxygen and changes metal
  6. 10. When oceans become more acidic from carbon
  7. 14. Microorganisms that help fix nitrogen
  8. 16. Taking in oxygen for energy