Metamorphism

Granite is an igneous rock that is formed through the slow solidification of magma. Accordingly, it does not change very much at lower metamorphic grades. Why is this so? A. Granite minerals are still stable at lower temperatures. B. Granite, like any other igneous rock, is geologically impossible to become a parent rock of metamorphic rock. C. Granite remains largely unchanged at lower metamorphic grades because its surrounding environment is constantly stable. D. All of the above.

A. Granite minerals are still stable at lower temperatures

Which of the following CORRECTLY describes the major role of pressure in producing metamorphic rocks? A. Pressure leads to foliation in the rock. B. Pressure decreases the size of mineral crystals. C. Pressure leads to a mineralogical change in the rock. D. Pressure facilitates change in the mineral composition of the rock

A. Pressure leads to foliation in the rock.

Which of the following is the cause of high temperature and pressure in regional metamorphism? A. impact force B. greater depth of burial C. the local intrusive heat source D. increased rate of radioactive decay

B. greater depth of burial

Blueschist metamorphism takes place within subduction zones. What are the temperature and pressure characteristics of this geological setting? A. low temperature and pressure B. high temperature and pressure C. low temperature and high pressure D. high temperature and low pressure

B. high temperature and pressure

Which of the following metamorphic rocks CANNOT form from a shale? A. hornfels B. marble C. schist D. slate

B. marble

How does the presence of a hot pluton contribute to metasomatism? I. A hot pluton heats the surrounding water, causing groundwater to circulate the rocks. II. Magma within the pluton is the source of minerals that seeps through the rocks and causes chemical exchange. III. The heat coming from the pluton heats up the rock and triggers recrystallization of its original minerals. A. Only I is correct. B. Only II is correct. C. I and II are correct. D. All are correct.

C. I and II are correct

Which of the following does NOT belong to the group? A. Gneiss B. Hornfels C. Marble D. Quartzite

C. Marble

What type of metamorphic rock will form if a mudrock experiences high-grade metamorphism? A. Gneiss B. Phyllite C. Schist D. Slate

C. Schist

What type of metamorphism occurs in the given illustration? a. Burial metamorphism b. Contact metamorphism c. Regional metamorphism d. Shock metamorphism

c. Regional metamorphism

While walking, Daniel picked up a rock that had been washed up onto the beach. Noticing that it has wavy bands of light and dark-colored minerals, he claimed that the rock is a metamorphic rock. Which of the following inferences about its formation is the MOST CORRECT? A. The pressure was the main agent in rock's formation which aligned the minerals into a new orientation. B. The rock was formed through high-pressure metamorphism made by the impact of a large body into the Earth's surface. C. The minerals in the rocks were altered through recrystallization changing their size into large crystals. D. The bands in the rock were formed through the deposition of minerals from the hot fluids that surround it during the formation process.

A. The pressure was the main agent in rock's formation which aligned the minerals into a new orientation.

Which of the following has the CORRECT set of major agents in metamorphism? A. temperature and pressure B. pressure and tectonic forces C. temperature and mineral fluids D. hydrothermal fluids and pressure

A. temperature and pressure

On a local field trip, a group of students noticed that they were walking across a path made of rocks that starts from shale into a slate and into a phyllite. What can you infer from the direction taken by the students concerning the grades of metamorphic rocks? A. It follows a decreasing metamorphic grade. B. It indicates an increasing metamorphic grade. C. It indicates an increasing degree of contact metamorphism. D. It shows a decreasing degree of regional metamorphism.

B. It indicates an increasing metamorphic grade

What process contributes to the metamorphism of oceanic crust at a spreading ridge? A. Dissolved minerals in the confined water within the rocks react with heat and trigger chemical reactions. B. The heat coming out from hydrothermal vents under the ocean heats up the rock and forms recrystallization of the original mineral content of the rock. C. Minerals present in the ocean water percolate through the rocks and get deposited within while replacing other minerals. D. Interaction of plates below the spreading oceanic crust creates horizontal movements and deforms the rocks within leading to formations of foliations and cracks.

D. Interaction of plates below the spreading oceanic crust creates horizontal movements and deforms the rocks within leading to formations of foliations and cracks.

Which of the following statements about the metamorphism of shale is FALSE? A. Foliation develops as metamorphism increases. B. The amount of water decreases as metamorphism increases. C. The clay minerals break down to form micas as metamorphism increases. D. The size of the minerals gets smaller as metamorphism increases.

D. The size of the minerals gets smaller as metamorphism increases.

In which geographic area will there be the HIGHEST potential for regional metamorphism? A. in the Philippine trench B. near an igneous intrusion C. at the core of the Himalayas D. in the mid-ocean ridge in the Atlantic Ocean

D. in the mid-ocean ridge in the Atlantic Ocean