How does rain cause that earthy odor?

ENN
Jan 14, 2015, 7:14 am26 pts
Ever notice an earthy smell in the air after a light rain? Now scientists at MIT believe they may have identified the mechanism that releases this aroma, as well as other aerosols, into the environment.Using high-speed cameras, the researchers observed that when a raindrop hits a porous surface, it traps tiny…

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