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Radiometric dating is a method for establishing the age of materials using the relative abundance of commonly occurring radio-isotopes. Some elements have isotopes whose rate of decay into other isotopes or other elements is known. Knowing how much of a particular isotope would have been present at the start and how much is still there gives a measure of how long the radiactive decay has been going on: that is, how old the specimen is.

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Q: What does radio metric dating mean?
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Related questions

Is a geological dating method based on the decay rates of radioactive elements?

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