GEOL 1001 Chapter : CHAPTER 7 Possible Exam Q&A
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Question 1: recrystallization occurs because thermal energy causes atoms to vibrate rapidly, break existing chemical bonds, and migrate to new positions on the crystal lattice where they are more stable under the hotter conditions. Correct answer: a) is basically a solid mass of interlocking quartz crystals. Question 3: roofers use the rock schist to shingle roofs because its foliation, called schistosity, causes it to break in convenient size. Question 4: dynamothermal metamorphism (regional metamorphism) produces only nonfoliated metamorphic rocks in the depths of mountain ranges which erosion eventually exposes as "mountain roots" hundreds of kilometers wide and thousands of kilometers long. Question 5: pick out the rock that is nonfoliated. Correct answer: a) all have identical metamorphic mineral assemblages. Question 8: foliation and folding in metamorphic rock like gneiss happen slowly, over hundreds of thousands of years, as huge masses of material are subjected to regional metamorphism. Correct answer: c) cannot be formed below 1200 c.
