Biogeochemical crossword puzzle

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Across
  1. 4. The process by which nitrate is reduced to nitrogen gas by soil microbes when oxygen is not present
  2. 7. A colorless, odorless, highly flammable gas
  3. 8. The exhalation of water vapor through the stomata.
  4. 9. return to the atmosphere through respiration, the decay of dead organisms, and the burning of fossil fuels
  5. 12. rain, snow, sleet, or hail that falls to the ground
  6. 14. The cycle of processes by which water circulates between the earth's oceans, atmosphere, and land
  7. 16. The life-supporting component of the air.
  8. 17. The process by which bacteria in soil and water oxidize ammonia and ammonium ions and form nitrites and nitrates
Down
  1. 1. liquid that is on the surface of the earth
  2. 2. The conversion of a vapor or gas to a liquid
  3. 3. converted into many forms, consecutively passing from the atmosphere to the soil to organism and back into the atmosphere
  4. 5. The transformation and translocation of blank in soil, water, and living and dead organic material
  5. 6. When anything solid turns into a gas without first becoming liquid
  6. 10. The process of turning from liquid into vapor
  7. 11. This element starts in the soil
  8. 13. Plants and animals releases this during respiration
  9. 15. Water found in the ground