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4.54 billion years old

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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 history of Earth concerns the development of planet Earth from its formation to the present day.

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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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In geology and related fields, a stratum is a layer of sedimentary rock or soil, or igneous rock that were formed at the earth's surface, with internally consistent characteristics that distinguish it from other layers.

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