Lightning crackles around a miles-high ash plume above Chile's Puyehue volcano on Saturday.A volcanic lightning storm isn't "unlike a regular old thunderstorm," Martin Uman,
a lightning expert at the University of Florida in Gainesville, told National Geographic News in 2010.The same ingredients are present: water droplets, ice, and possibly hail—all interacting with each other and with particles, in this case ash from the eruptions, to cause electrical charging, Uman said. 
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