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Scientists believe that Earth is about 4.6 billion years old. What was going on for all of those years? After studying evidence in rocks, scientists developed the geologic time scale.
Scientists believe that Earth is about 4.6 billion years old. What was going on for all of those years? After studying evidence in rocks, scientists developed the geologic time scale.
The history of Earth has been classified into eons, eras, periods, and epochs.
The history of Earth has been classified into eons, eras, periods, and epochs.
Map
Map
United States Geological Survey (USGS)
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United States Geological Survey (USGS)
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