Subject: Does sound diminish in volume as you increase elevation?

As one would travel higher in elevation, to points where the atmosphere is very 
thin, does the volume of sounds decrease?  I suppose the same question could 
apply to a vacuum jar-As air is removed from the jar would the sound of 
something (say, an alarm clock) be reduced so one could "hear" the reduction of 
volume as air is reduced?
Thanks!
Mark Munger's 6th grade science class

Re: Does sound diminish in volume as you increase elevation?