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Have you ever wondered how scientists, archeologists and others date things to a time in the past?

For example, how do they know when the dinosaurs lived or what time period the mummy they just found was from?

But did you know that we can also date a rock with a fossil?

Watch this video to find out how we use index fossils to establish the relative ages of rocks. We have over 95 college courses that prepare you to earn credit by exam that is accepted by over 2,000 colleges and universities.

Description: Radiometric Dating, Geologic Time, and the Age of the Radiometric Dating, Geologic Time, and the Age of the Radiometric Dating, Geologic Time, and the Age of the Radiomet...

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