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How is radioactive dating used to date fossils

Radiometric dating / Carbon dating

How is radioactive decay used to date fossils?

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Many rocks and organisms contain radioactive isotopes, such as U and C​ There are several common radioactive isotopes that are used for dating rocks, artifacts and fossils.​ Due to its long half-life, U is the best isotope for radioactive dating, particularly of older. Using relative and radiometric dating methods, geologists are able to answer the Numerical ages estimate the date of a geological event and can sometimes reveal Third, magnetism in rocks can be used to estimate the age of a fossil site​. All organic matter contains carbon. Upon death, Carbon 14 in the decomposing body undergoes its own "decomposition" or radioactive decay.