Why does Earth have an atmosphere?

Related questions

1. Where does the Earth's atmosphere end?
2. Who Discovered atmosphere?
3. What is the concentration of ozone in the ozone layer?
4. What are two examples of the atmosphere?
5. Why does the earth have an atmosphere?
6. Which gas in Earth's atmosphere tells us that there is life on Earth?
7. What is atmosphere in simple words?
8. How does the atmosphere keep Earth warm at night?
9. Who invented atmosphere?
10. Is it possible to create an atmosphere?

Tags

1. #oxygen
2. #retained
3. #subject
4. #gravity
5. #carbon
6. #other
7. #likely
8. #amounts
9. #trace
10. #earth
11. #dioxide
12. #argon
13. #composed
14. #gases
15. #nitrogen
16. #temperature
17. #atmosphere
18. #about