Posted by mimo on Friday, July 24, 2009 at 10:04am.
Here is a good place to begin:
http://www.google.com/search?hl=en&client=firefox-a&rls=org.mozilla:en-US:official&hs=MyL&ei=Q8JpSq_pEo7INeaf4M8M&sa=X&oi=spell&resnum=0&ct=result&cd=1&q=LAYER+OF+ATMOSPHERE+THAT+MAKES+RADIO+COMMUNICATION+POSSIBLE&spell=1
Sra
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