20 SPECTACULAR AND SCARY IMAGES OF EXTREME WEATHER
Lightning cracks during an eruption of Iceland’s Eyjafjallajökull volcano in 2010.
The eruption’s ash clouds delayed European air travel for nearly a week.
Storms over volcanoes contain the same ingredients as storms over your hometown - water droplets, ice, and occasionally hail. The interaction of all of these elements creates an electrical charge that sparks lightning. Active craters add ash to the mix.
(Related: “Iceland Volcano Pictures: Lightning Adds Flash to Ash” and “Pictures: Volcano Lightning, Illuminated.”)
For an in-depth exploration of extreme weather events around the world, read National Geographic magazine's September feature "Weather Gone Wild
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