Natural resources

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Across
  1. 4. symbiotic bacteria in nitrogen fixation
  2. 5. 75% of earths surface \
  3. 6. 21% of the atmosphere
  4. 9. When water gets released from clouds
  5. 10. from sea to land
  6. 12. from land to sea
  7. 15. process where water vapour becomes liquid
  8. 17. dead organic substances are broken down
  9. 19. burning
  10. 21. O3
Down
  1. 1. relates to living organisms
  2. 2. organic material that forms when animals decay
  3. 3. 78% of the atmosphere
  4. 7. NO3
  5. 8. product of respiration
  6. 11. elemental form of carbon
  7. 13. relates to non living items
  8. 14. process of water turning into water vapour
  9. 16. material that covers most of earths surface
  10. 18. free living bacteria in nitrogen fixation
  11. 20. NO2