Fires are a major environmental risk of underground coal mines.
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Q54: _ is an example of metamorphic rock.
A)
Q55: On average, it takes _ energy to
Q56: Metamorphic rocks are produced when rocks are
A)
Q57: Smelting ore, as in Ducktown, Tennessee, releases
Q58: It takes _ energy to recycle waste
Q59: The biggest risk to communities surrounding mountain
Q60: Reclamation of strip-mined land is difficult chiefly
Q62: Draw a diagram of the rock cycle.
Q63: The substitution of new materials (plastics, etc.)
Q64: Earthquakes do not occur in the center
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