Modern Marvels: Quarries: The work never stops. Hillsides are dynamited; massive drills splinter sheer stone walls, and giant cranes wrest 400,000 pound blocks from gigantic pits. The object of all this activity is rock--not precious stones or minerals, but everyday rock.... (more details for Modern Marvels: Quarries)

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File by Martin Applebaum (#2352)
2013-05-02 Grade: 11-12