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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 recentesSentado Pink Flowers on WallFri Bird Orange CrestThu Beachside Chairs SunnyWed Lion Blue Oil ArtTue Rubber Duck WaveSegunda-feira Storm in a TeacupSol Colorful Doughnuts Enigmas mais precedentes | |
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