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

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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.

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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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The geologic time scale is 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