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the process by which an unstable atomic nucleus loses energy by emitting radiation

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a method for determining the age of an object containing organic material by using the properties of radiocarbon, a radioactive isotope of carbon

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a method of dating geological or archeological specimens by determining the relative proportions of particular radioactive isotopes present in a sample.

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the time taken for the radioactivity of a specified isotope to fall to half its original value.

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the remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.

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an idealized cycle of processes undergone by rocks in the earth's crust, involving igneous intrusion, uplift, erosion, transportation, deposition as sedimentary rock, metamorphism, remelting, and further igneous intrusion.

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a layer of sedimentary rock or soil,

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a system of chronological dating that relates geological strata to time