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is the process by which an unstable atomic nucleus loses energy

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a radioactive isotope of carbon

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a radioactive isotope of carbon

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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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The Rock Cycle is a group of changes. Igneous rock can change into sedimentary rock or into metamorphic rock.

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a single bed of sedimentary rock, generally consisting of one kind of matter representing continuous deposition.

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The geologic time scale is a system of chronological dating that relates geological strata to time.