Biogeochemical Crossword Puzzle

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Across
  1. 2. the draining away of water from the surface of an area of land
  2. 7. colourless unstable toxic gas formed from oxygen.
  3. 8. process of burning something.
  4. 11. using up a resource.
  5. 12. a large natural or artificial lake used as a source of water supply.
  6. 13. fuel a natural fuel such as coal or gas.
  7. 15. cycle the process by which oxygen released into the atmosphere by photosynthetic organisms
  8. 16. when a plant absorbs water in its roots
  9. 17. process of turning from liquid to vapor.
  10. 20. involving or requiring free oxygen.
Down
  1. 1. person or thing eating something else.
  2. 3. fixing they contain symbiotic bacteria called rhizobia within nodules in their root systems
  3. 4. permeation of a liquid into something by filtration.
  4. 5. organism that decomposes organic material.
  5. 6. the action or process of precipitating a substance from a solution.
  6. 9. total mass of organism in a given area or volume
  7. 10. not derived from living organisms.
  8. 14. process of oxidizing or being oxidized.
  9. 18. a leguminous plant.
  10. 19. rain made sufficiently by acid from the atmosphere.