Understanding Our Planet Through Chemistry
The question of when the Earth was formed and when various events on it occurred has long fascinated humanity. In the past, various estimates of the age of the Earth have been made using the available technology. All estimates of this type changed drastically with the modern application of radioactivity.
U.S. Department of the Interior |
U.S. Geological Survey
URL: http://minerals.cr.usgs.gov/gips/na/under.html
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Page Last Modified: 07-May-2008@15:40
