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This interactive tutorial provides students with an overview of Earth's history and its relation to geologic time. Topics include the age of the Earth, the use of timelines, and the concepts of relative and actual age. Once these topics have been covered, their applications to rocks and fossils are explained through the concepts of superposition (oldest rocks on the bottom), the use of fossils to determine relative age, and the use of radiometric dating to determine absolute age. There is also an interactive geologic time scale where students can find descriptions of what the Earth was like by clicking on the various eons, eras, or periods.
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