Overview: In this series of lessons students learn the basic principles used to determine the age of rocks and fossils by using half-life in radioactive decay and stratigraphy. Author/Source: McKinney, Frank Grade level: 13-16 Time: One to two class periods. Concepts: Radiometric dating can often be used to determine the age of fossils. Scientists test their ideas using multiple lines of evidence. Scientists can test ideas about events and processes long past, very distant, and not directly observable. Teacher background: Geologic Time

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