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Solucionar las épocas para este rompecabezasFotoWhen naturally occuring graphite was discovered, chemistry was in its infancy and the substance was thought to be a form of lead. Consequently, it was called plumbago (Latin for "lead ore") . The black core of pencils is still sometimes referred to as "lead," even though it never contained the element lead. Share this Jigsaw Puzzle | Rompecabezas recientesSentado Wooden Boat SeagullsFri Pumpkin Pie SliceThu Skier Speed SelfieWed Horse DreamTue Birds on Barbed WireLunes Lilies on BlueSol Rolls Royce Spectre Rompecabezas más anteriores | |
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