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    Machine used carbon dating

    Though still heavily used, relative dating is now augmented by several modern dating techniques.

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    But while the difficulties of single life may be intractable, the challenge of determining the age of prehistoric artifacts and fossils is greatly aided by measuring certain radioactive isotopes.

    Carbon-14, or radiocarbon, is a naturally occurring radioactive isotope that forms when cosmic rays in the upper atmosphere strike nitrogen molecules, which then oxidize to become carbon dioxide.

    Green plants absorb the carbon dioxide, so the population of carbon-14 molecules is continually replenished until the plant dies.

    those that form during chemical reactions without breaking down).

    The unstable or more commonly known radioactive isotopes break down by radioactive decay into other isotopes.

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