Did you know that... when a powerful lightning bolt strikes the ground, it can leave behind a trace of itself in the form of a half-transparent glass tube called a fulgurite?7 photos
Such tubes are made from silicon (or sand) that has been melted under the influence of an electric current generated by a lightning strike. Fulgurites can penetrate several meters into the ground, but due to their fragile nature, it is extremely difficult to extract them in their entirety.







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