This How Old is it Really? - How Do We Know that the Earth is 4.6 Billion Years Old? presentation also includes:
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Eight neat slides lead to the understanding of how geologists have determined Earth's age. Most of the slides are dedicated to explaining the absolute dating method of assessment. Color diagrams display radioactive isotopes and a graph depicts half-life of radioactive elements. The final slide tells of how these actions help scientists estimate the age of our planet. This topic is relevant to earth science curriculum at the high school level.