Across
- 4. nitrogen also has always been present on the earth
- 7. water stored under the surface
- 8. for plant growth
- 9. is several miles below and above the surface of Earth
- 11. get nitrogen they need by consuming plants or other animals that
- 12. rocks, minerals and ground that are found on and in Earth
- 13. all living organisms on the planet
- 14. )
- 15. process which water is converted from its liquid state to the
- 17. The ammonium salts are absorbed onto clay in the soil and then
- 18. need nitrogen to grow
Down
- 1. made up of mostly nitrogen and some oxygen
- 2. water falling from atmosphere in form of rain hail snow sleet or freezing rain
- 3. altered by bacteria into nitrite (NO2-) and then nitrate
- 5. process where water moves above, on, and belowthe Earth's surface
- 6. organic molecules composed partially of nitrogen
- 8. process which water vapor is changed back into liquid water
- 10. Carbon moves from living things to the atmosphere.
- 16. carbon dioxide is pulled from the air to produce food made from
- 19. state