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Resolver épocas para este enigmaFotoWhen 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 | Enigmas recentesThu Roof Sea FlagWed Trabant FlowerpotTue French SardinesSegunda-feira Latvia ChurchSol Going Paddle BoardingSentado Woven Color GoldFri Blue Rope Tie Enigmas mais precedentes | |
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