METAMORPHISM



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What is the protolith of marble?
Correct Answer: limestone
                        
Question 2              
Identify the false statement. Hydrothermal fluids:
Correct Answer:   change a rock's chemical composition, a process known as exhumation.
                        
Question 3              
Which of the following statements is false? A metamorphic rock:
Correct Answer:   cannot be formed below 1200 °C.
                        
Question 4              
Which of the following statements is false? Extremely high heat of metamorphism:
Correct Answer: is necessary to elongate the large clasts in conglomerate to make flattened-clast conglomerate (metaconglomerate).
                        
Question 5              
Mylonite:
Correct Answer:   all of the above are true statements.
                        
Question 6              
Pick out the rock that is nonfoliated.
Correct Answer:   hornfels
                        
Question 7              
Quartzite:
Correct Answer:is basically a solid mass of interlocking quartz crystals.
                        
Question 8              
Which of the following statements is false? Metamorphic facies:
Correct Answer: are identical to metamorphic mineral assemblages.
                        
Question 9              
Which of the following statements about metamorphic rocks and their characteristic environments is true?
Correct Answer: Slate, phyllite, schist, and gneiss are found in areas of continental collision.
                        
Question 10              
Which of the following statements is false? Shields:
Correct Answer: are composed of extensive areas of sedimentary layers laid down on lava flows.
                        
Question 11              
Which is not a common process by which metamorphic rocks are formed?
Correct Answer:   schistosity
                        
Question 12              
Mountain building due to convergent-margin tectonics and to continental collision:
Correct Answer: all of the above are true.
                        
Question 13              
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: True
                        
Question 14              
Roofers use the rock schist to shingle roofs because its foliation, called schistosity, causes it to break in convenient size.
Correct Answer: False
                        
 Question 15              
Schist may form from a variety of protoliths that contain atoms necessary to make mica.
Correct Answer: True
                        

Question 16              
Foliation and folding in metamorphic rock like gneiss happen slowly, over hundreds of thousands of years, as huge masses of softened rock flow slowly and at differential speeds within the mass.
Correct Answer: True
                        

 Question 17              
Quartzite is a favorite material of sculptors because of its uniform texture, wide range of colors, and relative softness.
Correct Answer: False
                        

 Question 18              
Metamorphic zones are regions between isograds named after the index minerals that occur within them.
Correct Answer: True
                        
 Question 19              
Blueschist is a common metamorphic rock of continental shields.
Correct Answer: False
                        

 Question 20              
Metamorphic aureoles typically contain nonfoliated rock like hornfels, because the pluton intrusion provides heat but not the shearing stress necessary for foliation.
Correct Answer: True

Question 21              
In the United States you can see Precambrian metamorphic rocks in places where rivers have sliced deeply into Earth's surface, such as in the Grand Canyon.
Correct Answer: True
                        
Question 22              
When geologists say metamorphic grade, they're referring to the amount of metamorphic change, which depends primarily on the temperature involved; when they say facies, they mean the mineral assemblage (mineral contents) of the rock.                       
Correct Answer: True
                        
Question 23              
Dynamothermal metamorphism (regional metamorphism) produces 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.
Correct Answer: False


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