The Atmosphere!

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Across
  1. 4. layered cloud
  2. 5. water as a gas
  3. 7. carbon dioxide, methane, etc (2 words)
  4. 10. wispy, icy cloud
  5. 12. the gas we breathe in
  6. 13. thundercloud
  7. 15. contains the ozone layer
  8. 16. found in the stratosphere, protects from UV
  9. 18. layer where the meteorites burn up
  10. 21. a greenhouse gas (2 words)
  11. 22. a small rock from outer space that burns up in the mesosphere
Down
  1. 1. most common gas in the atmosphere
  2. 2. puffy cloud
  3. 3. the continuous movement of water on and above the Earth (2 words)
  4. 6. hottest layer of the atmosphere
  5. 8. mixture of gases surrounding Earth
  6. 9. almost all in the troposphere, caused by unequal heating of the earth and water in the air
  7. 11. densest layer of the atmosphere
  8. 14. the first organisms on earth
  9. 17. furthest layer of the atmosphere
  10. 19. warming of the atmosphere (2 words)
  11. 20. as altitude increase, air pressure _______