Atmosphere

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Across
  1. 2. the number of oxygen atoms in ozone
  2. 4. holds the atmosphere to the earth
  3. 7. releases nitrogen back into the air from matter
  4. 9. the two most abundant compounds in the air are water vapor and ___.
  5. 10. the second most abundant element in the atmosphere
  6. 12. process by which plants make oxygen
  7. 13. type of radiation the ozone protects us from
  8. 14. process that takes water from ocean,lakes,rivers
  9. 16. particles in the air
  10. 18. water vapor to liquid
  11. 19. the percent of nitrogen in the air
  12. 21. from emissions and sunlight to make ozone
Down
  1. 1. barometer that is sealed with a vacuum
  2. 3. takes nitrogen from the air and makes it usable for plants
  3. 5. instrument used to measure air pressure
  4. 6. process by which plants and animals give off water vapor
  5. 8. a mixture of gases that surround the earth
  6. 11. studies the atomosphere
  7. 15. a pattern of similar pressures
  8. 17. the element that makes up the smallest percent of the atmosphere
  9. 20. force per unit