Science crossword puzzle

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Across
  1. 3. how far you are from earth's surface
  2. 4. takes up 78%
  3. 5. greenhouse gas
  4. 6. made from warm water and humidity
  5. 7. takes pictures
  6. 9. In the stratosphere
  7. 11. when evaporation forms a cloud
  8. 14. the trapping of the greenhouse gases
  9. 15. connects with similar air pressure
  10. 16. sends signals
  11. 18. fair weather clouds
  12. 19. takes up 21%
Down
  1. 1. a large spinning vortex of wind
  2. 2. unfair weather clouds
  3. 3. measures wind speed
  4. 8. hottest layer
  5. 10. fulcrum,steel beam, load
  6. 12. connects with similar temp
  7. 13. stuck between two fronts
  8. 17. when two air masses meet