Where Does the Smell of Rain Come From?

I smell a science storm a-comin'!!
↓ More info and sources below ↓

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References:
"Nature of Argillaceous Odor" (1964) http://www.nature.com/nature/j....ournal/v201/n4923/ab
"Petrichor and Plant Growth" (1965)
http://www.nature.com/nature/j....ournal/v207/n5004/ab
Human nose can detect a trillion smells
http://news.sciencemag.org/bio....logy/2014/03/human-n
Petrichor and fish spawning
http://onlinelibrary.wiley.com..../doi/10.1111/j.1095-
Camels seek out wet soil smells
http://www.theguardian.com/sci....ence/2003/mar/06/sci
Chemistry of petrichor:
http://cen.acs.org/articles/91..../i18/Scent-Rain-Stra
http://www.itsokaytobesmart.co....m/post/85815194542/c
http://www.scientificamerican.....com/article/storm-sc

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