Across
- 4. the process of plants giving off water vapor
- 6. the -sphere consisting of all organisms
- 8. the process of water heating up and turning into water vapor
- 9. organisms taking in and releasing oxygen from their body
- 11. element that humans release upon exhalation
- 12. the reason the same of this substance is the same now as it was in the beginning of earth
Down
- 1. water coming down from the atmosphere in four possible forms
- 2. the -sphere containing water
- 3. ammonium salts being absorbed into clay in the soil and chemically altered by bacteria (also known as nitrification)
- 5. the -sphere that contains rocks
- 7. the layer of gasses that keep things in a planet
- 10. fuels that exist from the remains of old plants and animals