What glass-like tube is formed when lightning strikes sandy soil or rock?
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When lightning hits sandy ground, the extreme heat melts the silica instantly, fusing it into hollow, root-like glass tubes called fulgurites. Often called petrified lightning, these delicate structures can reach several feet in length and preserve the exact path the energy took through the earth. Photo: John Alan Elson, Wikimedia Commons, CC BY-SA 4.0.
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Source: Wikipedia (CC BY-SA)
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