In some instances a single mineral, a ________, suffices for determination of the pressure and temperature under which a metamorphic rock formed.
A. metamorphic pressure-temperature mineral
B. metamorphic index mineral
C. metamorphic key mineral
D. metamorphic trace mineral
E. metamorphic mica mineral
Answer: B
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The boundary between two air masses is called a(n)
A) dividing line. B) squall line. C) instability line. D) front.
Using the Periodic Table, what can you say about the element oxygen (O)? 
A. it has 6 electron shells and 2 electrons in the outer shell B. it has 6 neutrons and 2 protons C. it has 6 protons and 2 neutrons D. None of these choices are correct.
Folded layers of rock can form a wavelike pattern of troughs and crests. The layers near the crest (i.e. the upward fold) form
A) a syncline. B) an anticline. C) a tension zone. D) shear. E) a thrust fault.