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