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The idea of radioactive decay and half lives, a type of absolute dating, is shown through an activity using M&M's candy and graph paper. Sequencing Time, University of California, Berkeley. This 5-12-grade activity lets students place parts of their own life story into a time line so that they can better understand how geologic time is reconstructed by scientists. The site provides background information about stratigraphic principles and relative time, biostratigraphy (using fossils for relative dating), and radiometric dating. The site also provides fact sheets on the age of the Earth and isochron dating. Ph ET sims are based on extensive education research and engage students through an intuitive, game-like environment where students learn through exploration and discovery. Determining the Age of Rocks and Fossils, University of California, Berkeley.