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This brief review of Earth history starts with the Archeozoic Period and goes through the Devonian Period. It explains time divisions and that the basic unit of geologic time is the period, which comprises two or more...
If you?re looking for a science activity to help introduce environmental issues, or if you?re looking for fun and challenging real-world math problems, we invite you to take a look at this issue of Smithsonian in You...

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