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Why Volcanic Eruptions Can Spark Lightning

It’s the ultimate love-at-first-sight story: In the middle of the desert, hundreds of miles from anything else, lonely sand grains meet up in a crowd and decide to electrify each other. Sparks fly. sciencenewsPhysicists have long puzzled over why sand grains and other small particles can build up electrical charges as they collide with one another, sometimes to the point of discharging lightning... 

180 amazing lightning photos

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