Chapter 18: Earth's Atmosphere

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Across
  1. 8. hottest layer; aurora borealis occur here (436)
  2. 9. boundary between troposphere and stratosphere; jet streams are here(433)
  3. 10. envelope of gases that surrounds the earth (429)
  4. 11. Van Allen discovered this region in exosphere in 1958 (442)
  5. 14. __ and hydrogen are light gases in space
  6. 15. outermost layer; space (436)
  7. 17. chlorofluorocarbons; freon is an example; thought to deplete ozone (441)
  8. 18. uniform mixture of gases; troposphere-mesosphere (433)
  9. 20. Day of Creation in which "great expanse" was created (430)
  10. 21. rate of flow of energy (8 min) from sun through space (445)
Down
  1. 1. region in thermosphere that reflects radio waves (442)
  2. 2. steady change of temperature every km in altitude (433)
  3. 3. most abundant gas in our atmosphere; needed for proteins (433)
  4. 4. uneven mixture of gases in thermosphere and exosphere (433)
  5. 5. where true space begins in thermosphere 100 km (notes)
  6. 6. lowest layer of atmosphere; life and clouds (433)
  7. 7. fixates nitrogen in atmosphere (438; bottom paragraph)
  8. 12. OE scientists believe this is what all life came from (430)
  9. 13. middle layer; also coldest layer; meteoroids burn here (435)
  10. 16. second layer of atmosphere; jet streams are near here at tropopause
  11. 19. part of stratosphere that shields earth from harmful UV radiation (439)