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OpenStudy (anonymous):
A certain igneous rock contains about 25 percent dark silicate minerals. The remainder of the rock is mostly calcium rich plagioclase feldspar. What type of composition does this igneous rock have? A. granitic B. basaltic C. andesitic D. ultramafic
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OpenStudy (anonymous):
@Thad42
OpenStudy (anonymous):
B
OpenStudy (anonymous):
Which of these energy resources might replace dwindling petroleum supplies one day? A. coal and natural gas B. tar sands and uranium C. oil shale and tar sands D. wind and coal
OpenStudy (anonymous):
A
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