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

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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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The sub-discipline of geology that involves study of rock strata is called stratigraphy. Layering of rocks or sediment is also called stratification. A sequence of sedimentary layers stacked one atop the other is known as a stratigraphic section.

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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 remains or impression of a prehistoric organism preserved in petrified form or as a mold or cast in rock.

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Radioactive decay (also known as nuclear decay or radioactivity) is the process by which an unstable atomic nucleus loses energy (in terms of mass in its rest frame) by emitting radiation, such as an alpha particle, beta particle with neutrino or only a neutrino in the case of electron capture, gamma ray, or electron in the case of internal conversion

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The Rock Cycle is a group of changes. Igneous rock can change into sedimentary rock or into metamorphic rock. Sedimentary rock can change into metamorphic rock or into igneous rock. Metamorphic rock can change into igneous or sedimentary rock. Igneous rock forms when magma cools and makes crystals.