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The fossil's location in sedimentary rock tells scientists how old the fossil is, and the location of similar fossils across the world tells experts that the continents used to be closer together, but have drifted apart because of tectonic plate shifts. Tectonic Volcanoes In the short video, Life on Fire: Becoming a Fossil This video describes how the Australopithecus afarensis skeleton known as Lucy could have been fossilized. Using this technique, called radiometric dating, scientists are able to "see" back in time. Volcanism Volcanoes provide spectacular evidence that we are living on a dynamic planet, where land can be created or destroyed without regard to human structures or civilizations.

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Many chemical elements in rock exist in a number of slightly different forms, known as isotopes.

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8th Grade Earth Science

Underwater Hotspots The Hawaiian Islands are a unique island group in that they are an excellent example of land formed from a geologic process that has only recenlty been explored fully by geologists. This is particularly true of marine samples and contemporary shells may seem to be hundreds of years old. If the date has been calibrated it should be written as cal. In this video segment, Creating an Island Paradisefrom Naturelearn about the beginnings of a new volcanic island. A breakthrough came with the discovery of radioactivity at the beginning of the s. Video Length

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