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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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radioactive decay. (rā'dē-ō-āk'tĭv) The spontaneous transformation of an unstable atomic nucleus into a lighter one.

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any method of determining the age of earth materials or objects of organic origin based on measurement of either short.

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1. a method of dating geological or archeological specimens by determining the relative proportions of particular radioactive isotopes present in a sample.