Question 1

At the surface,potassium feldspar reacts with water to form clay; this is an example of ____________.

Accepted Answer

A)   diagenesis
B)   erosion
C)   metamorphism
D)   weathering D

Question 2

A mineral within a metamorphic rock that can be used to provide a narrow constraint on the temperature and pressure of formation of the rock is termed a(n)____________.

Accepted Answer

A)   thermineral
B)   index mineral
C)   mafic mineral
D)   halide mineral B

Question 3

Dynamothermal metamorphism produces ____________.

Accepted Answer

A)   foliated rocks only
B)   nonfoliated rocks only
C)   both foliated and nonfoliated rocks C

Question 4

Spreading peanut butter on bread is an application of ____________.

Accepted Answer

A)   compression
B)   shear stress

Question 5

Burial metamorphism produces ____________.

Accepted Answer

A)   foliated rocks only
B)   nonfoliated rocks only
C)   both foliated and nonfoliated rocks

Question 6

____________ commonly serves as a protolith in the formation of marble.

Accepted Answer

A)   Limestone
B)   Sandstone
C)   Shale
D)   Slate

Question 7

As compared to the amphibolite metamorphic facies,the greenschist facies ____________.

Accepted Answer

A)   consists of lower-grade rocks
B)   consists of higher-grade rocks
C)   is an identical temperature and pressure regime; greenschists and amphibolites bear different mineral assemblages only because of differences in protolith chemistry

Question 8

Clay minerals within a buried body of shale are recrystallized at 400ºC and high pressure to form mica,producing a rock called phyllite; this is an example of ____________.

Accepted Answer

A)   diagenesis
B)   erosion
C)   metamorphism
D)   weathering

Question 9

Within a single mountain range,____________.

Accepted Answer

A)   only low-grade metamorphic rocks are likely to be found
B)   only high-grade metamorphic rocks are likely to be found
C)   it is possible to find a variety of metamorphic rocks produced in distinct facies, including high-, low-, and intermediate-grade rocks

Question 10

A primary difference between phyllite and schist is ____________.

Accepted Answer

A)   schist contains mica, but phyllite contains only clay
B)   phyllite contains mica, but schist contains only clay
C)   mica crystals within schist are larger than those within phyllite
D)   mica crystals within phyllite are larger than those within schist

Question 11

Thermal (contact)metamorphism produces ____________.

Accepted Answer

A)   foliated rocks only
B)   nonfoliated rocks only
C)   both foliated and nonfoliated rocks

Question 12

Thermal (contact)metamorphism occurs ____________.

Accepted Answer

A)   in areas surrounding igneous intrusions
B)   only where gneiss is in contact with schist
C)   as consequence of the sinking of a broad region to great depth
D)   only at the surface, where rock is in contact with the atmosphere

Question 13

Foliated metamorphic rocks possess ____________.

Accepted Answer

A)   leafy plant fossils (ancient foliage) 
B)   a homogeneous texture resulting from randomly oriented grains
C)   a planar fabric consisting of mineral grains in preferred orientations or preferred patterns of association (banding) 
D)   minerals precipitated directly from sea water

Question 14

Net chemical change in metamorphic rock induced by reaction with hot groundwater is termed ____________.

Accepted Answer

A)   foliation
B)   metasomatism
C)   anachronism

Question 15

Metamorphism brings changes in mineral arrangement and the texture of rocks,but it never leads to new mineral assemblages.

Accepted Answer

A) True 
 B)False

Question 16

Gneiss typically forms under higher pressures than hornfels.

Accepted Answer

A) True 
 B)False

Question 17

The protolith subjected to metamorphism ____________.

Accepted Answer

A)   is always metamorphic rock to begin with
B)   is always igneous rock
C)   is always sedimentary rock
D)   may belong to any of the three primary rock types

Question 18

The process of high-grade metamorphic rocks being altered to form low-grade metamorphic rocks is termed ____________ metamorphism.

Accepted Answer

A)   foliated
B)   prograde
C)   retrograde
D)   dynamic

Question 19

Squashing a fly with a flyswatter is an example of ____________.

Accepted Answer