Physical Geography: Geologic Time 2000 film complet
Learn how scientists keep track of time on a very large scale with this instructional film that describes the differences between eras, epochs and ages, and how major changes in the Earth are plotted on the geologic timeline. The film also explains how potassium-argon dating technology can determine the age of ancient rocks, and includes a visit to Ohio State University, where researchers put these techniques into practice.
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