Nutrient Cycle Crossword

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Across
  1. 5. major component of all organic compounds, including carbohydrates, lipids, proteins, and nucleic acids.
  2. 6. forms part of DNA and RNA.
  3. 8. bacteria convert nitrogen gas into ammonia.
  4. 9. include clouds and precipitation, running water, and lightning.
  5. 12. N2
  6. 15. dramatic increase of algae and other primary producers due to the increase in nutrients.
  7. 16. burning fossil fuels and use of fertilizers.
  8. 17. closed loops of molecules that pass from one organism to another.
  9. 19. supply limits ecosystem productivity.
  10. 21. precipitation flows along the surface.
Down
  1. 1. is water in soil.
  2. 2. consist of any and all activities performed by living organisms.
  3. 3. water molecules evaporate into the air.
  4. 4. NH3
  5. 7. bacteria obtain energy by converting nitrates into nitrogen gas.
  6. 10. movement of water through ecosystems.
  7. 11. include volcanic eruptions.
  8. 13. biogeochemical cycles of matter pass the same atoms and molecules around again and again.
  9. 14. tiny droplets of water vapor that forms precipitation.
  10. 18. required to make protein and nucleic acids.
  11. 20. chemical substances that an organism needs to sustain life.