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