Metamorphic Rocks

10. What is the most prominent textural feature of regional metamorphic rocks? a. foliation b. bedding c. cataclasis d. ripples

* a. foliation

7. Which of the following statements about the metamorphism of a shale is false? a. With increasing metamorphism, the clay minerals break down to form micas. b. With increasing metamorphism, the grain size of the rock gets smaller. c. With increasing metamorphism, foliation develops. d. With increasing metamorphism, the amount of water in the rock decreases.

* b. With increasing metamorphism, the grain size of the rock gets smaller.

23. In what geologic environment does high pressure low temperature metamorphism occur? a. at mid ocean ridges b. in subduction zones c. adjacent to a big igneous intrusion d. in a fault zone near the surface

* b. in subduction zones

12. Marble is a metamorphic rock that forms from __________. a. granite b. limestone c. sandstone d. shale

* b. limestone

11. Which of the following metamorphic rocks cannot form from a shale? a. schist b. marble c. hornfels d. slate

* b. marble

18. Which of the following metamorphic rocks cannot form from a shale? a. schist b. marble c. hornfels d. slate

* b. marble

1. Hydrothermal metamorphism is very common in which of the following settings? a. at the earth's surface where rocks are exposed to wind and water. b. along shallow faults c. at mid-ocean ridges d. in mid-continental regions

* c. at mid-ocean ridges

21. During metamorphism, a quartz-rich sandstone will change into what type of rock? a. slate b. schist c. quartzite d. all of these

* c. quartzite

13. What type of metamorphism is caused by high temperature and high pressure imposed over a large volume of crust? a. burial b. contact c. regional d. cataclastic

* c. regional

4. Which of the following processes will cause metamorphism? a. hot water moving through b. an increase in temperature c. an increase in pressure d. all of these

* d. all of these

14. The parallel alignment of mica in a metamorphic rock is an example of ______. a. porphyroblasts b. bedding c. metasomatism d. foliation

* d. foliation

19. Which of the following rocks represents the highest metamorphic grade? a. slate b. schist c. phyllite d. gneiss

* d. gneiss

16. Which of the following metamorphic rocks is not paired with its protolith (parent rock)? a. greenstone//basalt b. quartzite//quartz sandstone c. schist//shale d. hornfels//dolomite

* d. hornfels//dolomite

2. Metamorphism occurs __________. a. adjacent to igneous intrusions b. along faults c. in subduction zones d. in all of these settings

* d. in all of these settings

17. Which of the following rocks can be considered gradational between an igneous and a metamorphic rock? a. gneiss b. zeolite c. amphibolite d. migmatite

* d. migmatite

3. What geologic environment is associated with high temperature, low pressure metamorphism? a. subduction of oceanic crust beneath an island arc b. collision of two continents c. deep burial beneath a hydrothermal lake d. the area immediately adjacent to an igneous intrusion

* d. the area immediately adjacent to an igneous intrusion

5. What is the most prominent textural feature of regional metamorphic rocks? a. foliation b. bedding c. cataclasis d. ripples

* a. foliation

15. Which of the following sets is arranged in order of increasing metamorphic grade? a. shale -> slate -> phyllite b. phyllite -> gneiss -> schist c. phyllite -> slate -> schist d. schist -> shale -> gneiss

* a. shale -> slate -> phyllite

22. According to what feature are metamorphic rocks classified? a. the presence or absence of foliation b. the rock's density c. the average grain size d. the rocks color

* a. the presence or absence of foliation

6. How can a geologist recognize a fault zone that formed deep within the crust? a. by the presence of migmatites b. by the presence of porphyroblasts c. by the presence of mylonites d. by the presence of shales

* c. by the presence of mylonites

20. Light-colored rocks with coarse bands of segregated light and dark minerals are called ______. a. quartzites b. schists c. gneisses d. granulites

* c. gneisses

9. The pressure and heat that drive metamorphism result from: a. The weight of overlying rock, solar heat, and nuclear fusion. b. The internal heat of the Earth, the weight of overlying rock, and stresses developed as rocks are deformed. c. Stresses developed as rocks are deformed, covalent bonding, and heat released during rock crystallization. d. The internal heat of the Earth, nuclear bonding, and heat released during chemical weathering.

b. The internal heat of the Earth, the weight of overlying rock, and stresses developed as rocks are deformed.

8. Which mineral can be responsible for the strong foliation in a schist? a. quartz b. mica c. calcite d. pyroxene

b. mica