B2 2020 Johnson

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Across
  1. 4. a gradual increase in overall global temperature due to the increase of greenhouse gases in the atmosphere
  2. 9. when the greenhouse effect goes out of control and the earth begins to heat up too much
  3. 10. main gas emitted from human activities; 93.5% of trace gases
  4. 11. too much of this can cause eutrophication
  5. 14. layer that protects the surface by causing meteors and meteorites to burn up here
  6. 16. much of this is released from livestock emissions
  7. 20. the process of gases trapping heat in the earth's atmosphere to keep the earth's temperature habitable for life
  8. 22. the mixture of gases surrounding earth
  9. 24. hottest layer because it is closet to the sun
  10. 25. greenhouse gases created by humans or as a by-product of human activity
  11. 26. layer where weather occurs
Down
  1. 1. greenhouse gases that are naturally occurring in the atmosphere
  2. 2. the burning of these creates many greenhouse gases
  3. 3. gas necessary for animals to breathe
  4. 5. a greenhouse gas that is part of the nitrogen cycle, but is not nitrogen
  5. 6. created as a substitute for CFC's, but are still powerful greenhouse gases
  6. 7. a greenhouse gas that is involved with weather and the water cycle
  7. 8. a gas that is in the sun; is atomic number 1 on the periodic table
  8. 12. gas that protects the earth's surface from harmful UV rays
  9. 13. gases that help to keep the temperature of the earth habitable for humans
  10. 15. causes the aurora borealis; in the thermosphere
  11. 17. the outer region of the atmosphere
  12. 18. makes up 1.3% of trace gases in the atmosphere; one of the main gases in the sun
  13. 19. man-made; ozone depleting
  14. 21. layer that houses ozone
  15. 23. layer of the atmosphere that contains a high amount of ions and is able to reflect radio waves; in the thermosphere