Nutrient Cycles Crossword

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Across
  1. 3. the process that converts ammonia into nitrites and nitrates.
  2. 5. process where bacteria convert nitrates back into nitrogen gas.
  3. 7. Another term for the water cycle.
  4. 10. breakdown of dead organisms that returns carbon to the soil.
  5. 15. burning of fossil fuels that releases carbon dioxide.
  6. 16. cooling of water vapor into liquid droplets that form clouds.
  7. 19. carbon-rich energy sources formed from ancient organisms.
  8. 20. process where decomposers convert organic nitrogen into ammonia.
  9. 21. process that converts nitrogen gas into ammonia.
  10. 23. form of nitrogen that makes up most of Earth’s atmosphere.
  11. 24. movement of water from the surface into the soil.
Down
  1. 1. water released from clouds as rain, snow, sleet, or hail.
  2. 2. greenhouse gas released during respiration and combustion.
  3. 4. movement of water downward through soil and rock layers.
  4. 6. usable form of nitrogen absorbed by plant roots.
  5. 8. reservoir that stores carbon for long periods of time.
  6. 9. process where liquid water changes into water vapor due to heat.
  7. 11. a process where organisms release energy and carbon dioxide.
  8. 12. release of water vapor from plant leaves into the atmosphere.
  9. 13. the process plants use to convert carbon dioxide into glucose.
  10. 14. the type of bacteria that lives in soil or plant roots and fix nitrogen.
  11. 17. water stored in pores and cracks underground.
  12. 18. water flowing over Earth’s surface into streams and rivers.
  13. 22. nitrogen compound produced by bacteria during decomposition.