Chapters 18 and 22 Crossword Puzzle

1234567891011121314151617181920
Across
  1. 2. true space begins here
  2. 7. month that is 27.3 days long
  3. 8. 2000km thick layer of the sun
  4. 14. where most weather occurs
  5. 17. visible, fluid surface of the sun
  6. 18. year that is 365.2425 days long
  7. 20. needed in all living things
Down
  1. 1. impression with steep walls & rim
  2. 3. suns path through the stars
  3. 4. from the sun, blows past earth
  4. 5. darker areas on the moon
  5. 6. temperature decreases with increased altitude
  6. 8. outermost layer of the sun
  7. 9. up to 32% is _________ by clouds and particles
  8. 10. small dark areas on the sun
  9. 11. reflects radio communication waves
  10. 12. develops a hole over Antarctica every spring
  11. 13. day that is 23 hr and 56 min
  12. 15. airplanes fly here
  13. 16. satellites orbit the earth
  14. 19. earths natural satellite