We will provide a list of web sites with relevant information. The geologic time scale is divided into eons, eras, periods, epochs, and ages. Our activities, and the time scale for download above, ...

Prehistoric time line, geologic time scale, photos, facts, maps, and more from National Geographic. Humans have walked the Earth for 190,000 years, a mere blip in Earth's 4.5-billion-year history.

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Building—and sustaining—these relationships takes time and effort. Many intervention studies are ... However, even if trials are well-conducted and reported, if there is limited potential for scale-up ...