2A Crossword

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