the april 2010 volcanic eruptions in eyjafjallajokull, iceland. known as a dirty thunderstorm, this phenomenon is yet to be explained by science, as the source of the lightning (or the specific mechanism by which particles of differing charges are separated in the ash cloud) continues to be debated. (click pic or link for credit x, x, x, x, x, x. see also: sakurajima and puyehue for more dirty lightning)
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