From where does atmosphere come from

Question: From where does atmosphere come from
- Keywords:
  atmosphere,
  earth
Asked by alan14211421 to Alessandro, Angela, Claudia, Marina, Phil on 14 Mar 2013.
- Phillip Wilkinson answered on 14 Mar 2013:
  
  Hi!
  
  Its a complicated answer to a great question, but this video should explain everything!
  
  -> http://www.youtube.com/watch?v=A-rsp-kTirA

Question: From where does atmosphere come from