Modern Marvels: Diamond Mines: Half a mile below the earths surface, men mine for rough diamonds--a pure carbon substance. Brilliant when cut and polished, they are marketed as the most precious gem in the world. From the earliest mines of the fourth century B.C. to todays... (more details for Modern Marvels: Diamond Mines)

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File by Andy Temme (#846)
2009-11-23 Grade: 9-10
File by J. Bartoszek (#1318)
2010-11-12 Grade: 6-8