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Tree Rings, Ice Cores, and Varves

Introduces three methods scientists use to determine the absolute age of a material: tree rings, ice cores, and varves.

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Earth Science Evidence About Earth's Past
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    Understanding Geologic Time Lesson Plan
    Community Contributed
    Students take an informational tour to gain a basic understanding of geologic time, the evidence for events in Earth’s history, relative and absolute dating techniques, and the significance of the Geologic Time Scale.
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