Question 1

Metamorphic rocks may form from

Accepted Answer

A) igneous rocks. 
B) sedimentary rocks. 
C) other metamorphic rocks. 
D) any of the major rock types. 
A) igneous rocks. 
B) sedimentary rocks. 
C) other metamorphic rocks. 
D) any of the major rock types.

Question 2

Marble is a metamorphic rock that forms from

Accepted Answer

A) granite. 
B) limestone. 
C) sandstone. 
D) shale. 
A) granite. 
B) limestone. 
C) sandstone. 
D) shale.

Question 3

Under what P and T conditions does zeolite-facies metamorphism occur?

Accepted Answer

A) less than 5 kbars and 200°C 
B) 5 to 10 kbars and 200 to 400°C 
C) less than 5 kbars and greater than 400°C 
D) greater than 5 kbars and less than 400°C 
A) less than 5 kbars and 200°C 
B) 5 to 10 kbars and 200 to 400°C 
C) less than 5 kbars and greater than 400°C 
D) greater than 5 kbars and less than 400°C

Question 4

Approximately what is the pressure on a rock at 15 km depth in Earth's crust? (Note: 1 bar is approximately 1 atmosphere and 1000 bars equals 1 kbar.)

Accepted Answer

A) 4 bars 
B) 40 bars 
C) 400 bars 
D) 4 kbars 
A) 4 bars 
B) 40 bars 
C) 400 bars 
D) 4 kbars

Question 5

For any given depth along the P-T path of a metamorphic rock the prograde path is always at a

Accepted Answer

A) lower pressure. 
B) higher pressure. 
C) lower temperature. 
D) higher temperature. 
A) lower pressure. 
B) higher pressure. 
C) lower temperature. 
D) higher temperature.

Question 6

Which of the following rocks represents the highest grade of metamorphosed mafic volcanic rocks?

Accepted Answer

A) amphibolite 
B) blueschist 
C) greenschist 
D) granulite 
A) amphibolite 
B) blueschist 
C) greenschist 
D) granulite

Question 7

A metamorphic rock that is described as porphyroblastic has

Accepted Answer

A) original igneous rock textures. 
B) abundant equant minerals. 
C) large crystals in a fine-grained matrix. 
D) no preferred alignment of minerals. 
A) original igneous rock textures. 
B) abundant equant minerals. 
C) large crystals in a fine-grained matrix. 
D) no preferred alignment of minerals.

Question 8

During metamorphism,changes in the bulk composition of a rock occur primarily as a result of

Accepted Answer

A) increases in pressure. 
B) reaction with hydrothermal fluids. 
C) increases in temperature. 
D) decreases in temperature. 
A) increases in pressure. 
B) reaction with hydrothermal fluids. 
C) increases in temperature. 
D) decreases in temperature.

Question 9

Which of the following metamorphic facies represents the highest temperature?

Accepted Answer

A) amphibolite 
B) blueschist 
C) granulite 
D) greenschist 
A) amphibolite 
B) blueschist 
C) granulite 
D) greenschist

Question 10

What type of metamorphic rock was once used to make blackboards because of its ability to split easily into thin sheets along smooth,parallel surfaces?

Accepted Answer

A) hornfels 
B) quartzite 
C) schist 
D) slate 
A) hornfels 
B) quartzite 
C) schist 
D) slate

Question 11

Where does seafloor metamorphism take place?

Accepted Answer

A) continent collision zones 
B) subduction zones 
C) divergent plate boundaries 
D) transform plate boundaries 
A) continent collision zones 
B) subduction zones 
C) divergent plate boundaries 
D) transform plate boundaries

Question 12

Eclogite rocks form during ___________ metamorphism.

Accepted Answer

A) high-pressure 
B) ultra-high-pressure 
C) burial 
D) seafloor 
A) high-pressure 
B) ultra-high-pressure 
C) burial 
D) seafloor

Question 13

Which of the following rocks can be considered gradational between an igneous and a metamorphic rock?

Accepted Answer

A) amphibolite 
B) gneiss 
C) migmatite 
D) zeolite 
A) amphibolite 
B) gneiss 
C) migmatite 
D) zeolite

Question 14

In which of the following tectonic settings is the depth to the 1300˚C isotherm greatest?

Accepted Answer

A) volcanic mountain belt 
B) subduction zone 
C) zone of plate extension 
D) stable continental lithosphere 
A) volcanic mountain belt 
B) subduction zone 
C) zone of plate extension 
D) stable continental lithosphere

Question 15

During metamorphism,the process called metasomatism does not change the ______ of the affected rock.

Accepted Answer

A) chemical composition 
B) mineral chemistry 
C) mineral content 
D) texture 
A) chemical composition 
B) mineral chemistry 
C) mineral content 
D) texture

Question 16

Which of the following factors remains constant and does not vary depending on tectonic setting?

Accepted Answer

A) the geothermal gradient 
B) the thickness of the lithosphere 
C) the rate of pressure increase with depth 
D) the depth to the 1300˚C isotherm 
A) the geothermal gradient 
B) the thickness of the lithosphere 
C) the rate of pressure increase with depth 
D) the depth to the 1300˚C isotherm

Question 17

Which of the following metamorphic rocks is incorrectly paired with its parent rock?

Accepted Answer

A) greenstone - basalt 
B) quartzite - granite 
C) marble - limestone 
D) schist - shale 
A) greenstone - basalt 
B) quartzite - granite 
C) marble - limestone 
D) schist - shale

Question 18

Which of the following tectonic settings will be coolest at 30 km depth?

Accepted Answer

A) regions of continental extension 
B) stable continental lithosphere 
C) volcanic arcs 
D) The temperature in all three tectonic settings above will be the same at 30 km depth. 
A) regions of continental extension 
B) stable continental lithosphere 
C) volcanic arcs 
D) The temperature in all three tectonic settings above will be the same at 30 km depth.

Question 19

Metasomatism does not involve a change in

Accepted Answer

A) bulk rock chemistry. 
B) mineral composition. 
C) fluid composition. 
D) rock texture. 
A) bulk rock chemistry. 
B) mineral composition. 
C) fluid composition. 
D) rock texture.

Question 20

During metamorphism a rock will not

Accepted Answer

A) loose its solid form. 
B) change shape. 
C) change its texture. 
D) experience metasomatism. 
A) loose its solid form. 
B) change shape. 
C) change its texture. 
D) experience metasomatism.

Exam 6: Metamorphism: Alteration of Rocks by Temperature and Pressure

Metamorphic rocks may form from

Marble is a metamorphic rock that forms from

Under what P and T conditions does zeolite-facies metamorphism occur?

Approximately what is the pressure on a rock at 15 km depth in Earth's crust? (Note: 1 bar is approximately 1 atmosphere and 1000 bars equals 1 kbar.)

For any given depth along the P-T path of a metamorphic rock the prograde path is always at a

Which of the following rocks represents the highest grade of metamorphosed mafic volcanic rocks?

A metamorphic rock that is described as porphyroblastic has

During metamorphism,changes in the bulk composition of a rock occur primarily as a result of

Which of the following metamorphic facies represents the highest temperature?

What type of metamorphic rock was once used to make blackboards because of its ability to split easily into thin sheets along smooth,parallel surfaces?

Where does seafloor metamorphism take place?

Eclogite rocks form during ___________ metamorphism.

Which of the following rocks can be considered gradational between an igneous and a metamorphic rock?

In which of the following tectonic settings is the depth to the 1300˚C isotherm greatest?

During metamorphism,the process called metasomatism does not change the ______ of the affected rock.

Which of the following factors remains constant and does not vary depending on tectonic setting?

Which of the following metamorphic rocks is incorrectly paired with its parent rock?

Which of the following tectonic settings will be coolest at 30 km depth?

Metasomatism does not involve a change in

During metamorphism a rock will not

The Earth System

Plate Tectonics: The Unifying Theory

Earth Materials: Minerals and Rocks

Igneous Rocks: Solids From Melts

Sedimentation: Rocks Formed by Surface Processes

Deformation: Modification of Rocks by Folding and Fracturing

Clocks in Rocks: Timing the Geologic Period

Early History of the Terrestrial Planets

History of the Continents

Geobiology: Life Interacts With Earth

Volcanoes

Earthquakes

Exploring Earths Interior

The Climate System

Weathering,erosion,and Mass Wasting: Interactions Between the Climate and Plate Tectonic Systems

The Hydrologic Cycle and Groundwater

Stream Transport: From Mountains to Oceans

Winds and Deserts

Coastlines and Ocean Basins

Glaciers: the Work of Ice

Landscapes: Tectonic and Climate Interaction

The Human Impact of Earths Environment

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