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Diorama of the Geologic Period

Earth is estimated to be 4.6 billion years old and ever-changing. Scientists have organized Earth’s history into geologic time periods. These time periods include the Precambrian, Paleozoic, Mesozoic, and Cenozoic Eras. Within these eras can be found various climates, landforms, and living things that have changed and evolved over time. How did the climate change over the course of the history of Earth?

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