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The carbon-14 it contained at the time of death decays over a long period of time.

By measuring the amount of carbon-14 left in dead organic material the approximate time since it died can be worked out.

If a geologist claims to be younger than his or her co-worker, that is a relative age.

If a geologist claims to be 45 years old, that is an absolute age.

This implies that something about the radioisotope abundances are known (or assumed) at the time of formation.

Teachers have said that rocks' "internal clocks" when they form.

There's a small amount of radioactive carbon-14 in all living organisms.

When they die no new carbon-14 is taken in by the dead organism.

How, then, would one be able to distinguish its date of formation?For example, in 1991, two hikers discovered a mummified man, preserved for centuries in the ice on an alpine mountain.Later called Ötzi the Iceman, small samples from his body were carbon dated by scientists.Geologists do not use carbon-based radiometric dating to determine the age of rocks.Carbon dating only works for objects that are younger than about 50,000 years, and most rocks of interest are older than that.

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