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The age of the Earth is approximately 4.54 ± 0.05 billion years

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the process by which an unstable atomic nucleus loses energy

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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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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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Igneous rock can change into sedimentary rock or into metamorphic rock. Sedimentary rock can change into metamorphic rock or into igneous rock.

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The history of Earth concerns the development of planet Earth from its formation to the present day.

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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 major installments feature protagonist Gordon Freeman, a theoretical physicist who battles an alien invasion.

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In geology and related fields, a stratum is a layer of sedimentary rock or soil, or igneous rock where 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 (stratigraphy) to time.