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any method of determining the age of earth materials or objects of organic origin based on measurement of either short-lived radioactive elements or the amount of a long-lived radioactive element plus its decay product.

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the determination of the age of objects of organic origin by measurement of the radioactivity of their carbon content.

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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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For example, 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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The definition of a fossil is the preserved remains of a prehistoric organism or is slang for someone or something that is old and outdated. An example of a fossil is the preserved remains from a prehistoric organism that have been preserved inside rock.

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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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one of a number of portions or divisions likened to layers or levels: an allegory with many strata of meaning. Geology. a single bed of sedimentary rock, generally consisting of one kind of matter representing continuous deposition.

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The geologic time scale (GTS) is a system of chronological dating that relates geological strata (stratigraphy) to time. It is used by geologists, paleontologists, and other Earth scientists to describe the timing and relationships of events that have occurred during Earth's history.