I am taken from a deep mine, and then locked up in a wooden case from which I am never released, yet I am used by almost everyone. What am I?
Pencil lead
Graphite ('lead') is mined from the earth and encased inside wooden pencils for writing.
About this riddle
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Difficulty: Medium. More like this: Wordplay riddles with answers or try Anagrid for a different kind of puzzle.
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