How were rocks formed?

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  • Created by: Qiao-Chu
  • Created on: 13-04-13 17:07

Geologists usually measure time in hundreds of thousands of years. The earth is about 4,600 million years old and for much of that time, the earth was cooling and forming a basic atmosphere. Life on earth only abundant until 542 million years ago. From this time, geologists divided time into…


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