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The age of the Earth is approximately 4.54 ± 0.05 billion years (4.54 × 10⁹ years ± 1%).

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the process by which an unstable atomic nucleus loses energy (in terms of mass in its rest frame) by emitting radiation,

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

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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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A fossil is any preserved remains, impression, or trace of any once-living thing from a past geological age.

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the half-life of a radioactive substance is the amount of time it takes for half of its atoms to decay, and the half-life of a drug is the amount of time it takes before half of the active elements are either eliminated or broken down by the body.

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In geology and related fields, a stratum (plural: strata) is a layer of sedimentary rock or soil.

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