How were rocks formed?
- Created by: Qiao-Chu
- Created on: 13-04-13 17:07
Fullscreen
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…
Comments
No comments have yet been made