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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 age of the Earth is approximately 4.54 ± 0.05 billion years

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spontaneous transformation of an unstable atomic nucleus into a lighter one, in which radiation is released in the form of alpha particles, beta 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 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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is a group of changes. Igneous rock can change into sedimentary rock

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a stratum is a layer of sedimentary rock or soil,

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is a system of chronological dating