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little over 4.5 billion years old,

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Process by which an unstable atomic nucleus loses energy.

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The same thing as Radiometric dating.

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Dating geological or archeological specimens by to ishow old.

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Time taken for the radioactivity of a specified isotope to fall to half its original value.

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Development of planet Earth from its formation.

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Remains  of a prehistoric organism preserved.

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Rock Cycle is a group of changes that can happen to all rock.

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Layer of sedimentary rock or soil, or igneous rock.

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To describe the timing and relationships of events that have occurred during Earth's history.