coal is mined in a series of rooms cut into the coalbed. Pillars of unmined coal are left intact, and serve to support the mine roof, as miners advance through the coal seam.
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Obelisk
Two syllables. Pil-lar.
The Washington monument
Most of the times, strip mining has positive and negative consequences. Usually, the viewers get the positive aspect of strip mining, and the performers are affected by the loneliness and long nights of working 12 hour shifts. Err, my sources say that it's actually not that lonely, and the pay is good.... So, I guess strip mining is only positive.
Minnesota Mining and Manufacturing Company