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4.54 billion years old

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the process by which an unstable atomic nucleus loses energy  by emitting radiation, such as an alpha particle, beta particle with neutrino or only a neutrino in the case of electron capture, gamma ray, or electron

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Radiocarbon dating is 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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Radiometric dating or radioactive dating is a technique used to date materials such as rocks or carbon, in which trace radioactive impurities were selectively incorporated when they were formed.

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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.

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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