Geologists studying the western side of the Giant's Causeway, Antrim, Northern Ireland. Basalt columns from an ancient volcanic fissure eruption. Cote occidental du pave des Geans dans le Conte d'Antrim en Irlande. Copperplate engraving by Gaetano Riboldi from Scipion Breislak’s Traite sur la Structure Exterieure du Globe, Treatise on the Exterior Structure of the Globe, Jean-Pierre Giegler, Milan, 1822.

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Photo credit: © Florilegius / Alamy / Afripics
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