What causes the pleasant "smell of rain?"
Correct answer: A combination of bacterial spores, oils, and acidity
Timoteo
I'm surprised they said all that and didn't give the name of this pleasant sensation - petrichor.
Republic of China
This is caused from the build up of plant oils being released into the air and combining with a substance called geosmin. Geosmin is a compound given off by a type of soil bacteria called actinomycetes.
Mori
this description was ridiculously roundabout, and as Timoteo said...they didnt even give it it's name