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The age of the Earth is approximately 4.54 ± 0.05 billion years (4.54 × 10⁹ years ± 1%). This dating is based on evidence from radiometric age-dating of meteorite material and is consistent with the radiometric ages of the oldest-known terrestrial and lunar samples.

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radioactive decay. (rā'dē-ō-āk'tĭv) 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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an idealized cycle of processes undergone by rocks in the earth's crust, involving igneous intrusion, uplift, erosion, transportation, deposition as sedimentary rock, metamorphism, remelting, and further igneous intrusion.

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Earth definition. The planet on which we live — the third planet from the sun. Note: The Earth was formed at the same time as the sun, about 4.6 billion years ago. ... Note: On the Earth's surface, the oceans and the continents form the stage on which the evolution of life takes place.

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an antiquated or stubbornly unchanging person or thing.
a word or phrase that has become obsolete except in set phrases or forms, e.g., hue in hue and cry.

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the time taken for the radioactivity of a specified isotope to fall to half its original value.
the time required for any specified property (e.g., the concentration of a substance in the body) to decrease by half.

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