Asked by Sandra
                Which process explains why the terrestrial planets do not have hydrogen and helium in their atmospheres?  
thermal escape (??)
condensation
out gassing
solar wind
            
            
        thermal escape (??)
condensation
out gassing
solar wind
Answers
                    Answered by
            Damon
            
    Yes, I would guess those light gasses would exceed escape velocity due to heat.
    
                    Answered by
            Sandra
            
    Thanks much!!
    
                    Answered by
            Damon
            
    yes, here
http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&uact=8&ved=0CCQQFjABahUKEwjI1qjtttzIAhVLGz4KHfxjBKY&url=http%3A%2F%2Fwww.atmos.washington.edu%2F~davidc%2Fpapers_mine%2FCatling2009_SciAm_AtmEscape_Preprint.pdf&usg=AFQjCNE-vlUw54iLGlGBqrCfCQJ1CQHcIw&sig2=09z2PlaTuIUXxwPV5ia5jQ
    
http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&uact=8&ved=0CCQQFjABahUKEwjI1qjtttzIAhVLGz4KHfxjBKY&url=http%3A%2F%2Fwww.atmos.washington.edu%2F~davidc%2Fpapers_mine%2FCatling2009_SciAm_AtmEscape_Preprint.pdf&usg=AFQjCNE-vlUw54iLGlGBqrCfCQJ1CQHcIw&sig2=09z2PlaTuIUXxwPV5ia5jQ
                    Answered by
            Damon
            
    You are welcome.
    
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