Although muscovite, feldspar and quartz are not considered useful as index minerals, which of the following situations could be useful in determining the grade of metamorphism in a region?
A) the coexistence of muscovite, feldspar and quartz
B) the disappearance of rocks containing muscovite and quartz
C) the coexistence of feldspar and quartz
D) the disappearance of rocks containing quartz
Answer: B
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A. Pump it to the surface, clean it, and return it to the aquifer. B. Inject microorganisms to clean up contamination. C. Pump nanoparticles of inorganic compounds to remove pollutants. D. Use methods to prevent contamination. E. Use bottled water as a substitute.
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