Earth's Amazing Time Machine
Earth's immense age and the Geological Time Scale (GTS).; How the GTS organizes billions of years into eons and eras.; The four grand eons: Hadean, Archean, Proterozoic, and Phanerozoic.; Key events and life forms in the Paleozoic, Mesozoic, and Cenozoic Eras.; Why understanding geological time is important for geography, science, and our world.
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