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Part of the Dinosaurs: Activities and Lesson Plans Curriculum Collection.
Geologists at the American Museum of Natural History study rock layers and the plant and animal fossils found in them. They use radiometric dating to help establish the age of rocks. In doing so, they also establish the age of the fossils found in rocks. From the evidence they gather, geologists can piece together the physical history of the Earth.
Students may be able to tell you how long ago dinosaurs lived, but it is difficult to conceptualize that enormous amount of time. The following activity will help students gain an understanding of geologic time.