Fulgurites: The Power of Lightning (U.S. National Park
Mar 27, 2017 At Great Sand Dunes National Park & Preserve, the explosive power of lightning is captured in blackish tubes of glass called fulgurites. At 50,000 degrees F—hotter than the surface of the sun!—lightning blasts the sand, vaporizing the area where the bolt of electricity shoots through the sand and melting the surrounding sand into dark glass
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