Extracting coal and oil
Jun 23, 2009 - 00:01:02
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Open cast mines
A fault is an underground hazard. By drilling a series boreholes, miners start the safe development of an open cast mine.
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Open cast mines is an episode from Earth's physical resources: extracting coal and oil - for iPod/iPhone. A fault is an underground hazard. By drilling a series boreholes, miners start the safe development of an open cast mine. The episode...
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Published Jun 23, 2009, 00:01:42 long, audio available.
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