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A half-life is the time it takes for half of the atoms in an isotope to decay. Two half lives is 11,460 years and three half lives is 17,190 years.Given enough half lives, there eventually isn't enough carbon that remains.
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This radiometric dating technique is used when dating igneous and metamorphic rock, but not sedimentary rock.
This concept was brought up by a fellow named James Hutton who felt that the Earth was much older than a few thousand years.
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