What causes aurora borealis?

Related questions

1. What month is the best time to see the Northern Lights in Iceland?
2. How often do the Aurora Borealis occur?
3. What month is best to see Northern Lights in Iceland?
4. Where can you see the northern lights in the US?
5. Can you see Northern Lights in November?
6. Where do you see the northern lights in Iceland?
7. What is the best month to view the northern lights in Iceland?
8. Is Greenland a good place to see the northern lights?
9. Can you see Northern Lights from Greenland?
10. When can you see the northern lights in Reykjavik?

Tags

1. #state
2. #particles
3. #higher
4. #bottom
5. #lower
6. #process
7. #atmosphere
8. #electrons
9. #atoms
10. #beautiful
11. #earth
12. #photon
13. #aurora
14. #light
15. #northern
16. #release
17. #strike
18. #cause
19. #creates
20. #charged
21. #lights
22. #energy