Respuesta :

Answer:

1= Atmosphere 2= vairiable

Part 1-
1. Atmosphere
2. Troposphere
3. Mesosphere
4. Closest
5. Clouds
6. Weather
7. Mass
8. Stratosphere
9. Jet stream
10. Airplanes
11. Jet stream
12. Lower
13. Mesosphere
14. Meteors
15. Stars
16. Thermosphere
17. Widest
18. Electrically
19. Ions
20. Thermosphere
21. Northern

Part 2-
1. Nitrogen
2. Oxygen
3. Atmosphere
4. Fixed
5. Dioxide
6. Vapor
7. Ozone
8. Variable
9. Time