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This age may represent the age of the Earth's accretion, of core formation, or of the material from which the Earth formed.

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Radioactive decay is 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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Radiocarbon dating is the determination of the age or date of organic matter from the relative proportions of the carbon isotopes carbon-12 and carbon-14 that it contains.

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Radiometric dating is 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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Half life is 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. Nearly all branches of natural science have contributed to the understanding of the main events of Earth's past.

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Fossils are 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 an idealized cycle of processes undergone by rocks in the earth's crust.

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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.