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The process by which an unstable atomic nucleus loses energy by emitting radiation, such as an alpha particle, beta particle, with neutrino or only neutrino in the case of electron capture, gamma ray, or electron.

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A radio method for determining the age of an object containing organic material by using the properties of radiocarbon.

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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 time required for any specific property to decrease by half.

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Any preserved remains, impression, or any trace of once-living thing from the past geological age. For example, bones, shells, exoskeletons stone imprints of animals or microbes, hair, petrified wood, oil, coal, and DNA remnants.

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A group of changes.Igneous rock can change into sedimentary rock or into or metamorphic rock.

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

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A system of chronological  dating that relates geological strata 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.