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Clocks in the rocks
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Discusses the divisions of time used by geologists to record earth's history and includes information on fossils, radioactive dating, and prehistoric life.
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Discusses the divisions of time used by geologists to record earth's history and includes information on fossils, radioactive dating, and prehistoric life.
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"Discusses the divisions of time used by geologists to record earth's history and includes information on fossils, radioactive dating, and prehistoric life."
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