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The spontaneous transformation of an unstable atomic nucleus into a lighter one, in which radiation is released in the form of alpha particles, beta particles, gamma rays, and other particles

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another term for carbon dating

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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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In geology and related fields, a stratum is a layer of sedimentary rock or soil, or igneous rock

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a system of chronological dating that relates geological strata to time