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Hadean Eon (Earth’s Formation)
Archean Eon (Life Beginning and Photosynthesis)
Proterozoic Eon (Oxygen Crisis and First Snowball Earth)
Paleozoic Era (Transformation - Animals and Plants Emanate onto Land)
Mesozoic Era (First Mammals and Birds)
Cenozoic Era (Climate changes; Homo Habilis and Evolution)
Anthropocene (Humans Impact Earth’s Geology and Ecosystems)
Precambrian (Earth's Geologic Time Scale Impact)
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