While the lightning in a regular storm is caused by static buildup from ice particles colliding together at high speed, in a "dirty" thunderstorm it's the ash particles that are to blame.
Who knew? Geologists, probably.
(h/t BBC Earth)
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Gianni Jaccoma is a staff writer for Thrillist, and he desperately wants to visit Patagonia. Follow his tweets about expensive outerwear @gjaccoma, and send your news tips to firstname.lastname@example.org