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Metamorphic Rocks Practice Exam

front 1

Metamorphism occurs when a rock ___________.

back 1

experiences conditions that are significantly different from those that formed the rock

front 2

The low grade metamorphism of shale produces ________.

back 2

slate

front 3

Mountain building causes metamorphism because __________.

back 3

all the above

front 4

The most important agent(s) of metamorphism, according to your text, is (are) ___________.

back 4

heat

front 5

The major role of thermal energy (heat) in metamorphism is _________.

back 5

driving chemical reactions that head to recrystallization

front 6

In an area where the temperature increase with depth averages 20 degrees C per kilometer, the temperature at a depth of 5 kilometers would be __________.

back 6

100 degrees C

front 7

The quartz in granite begins to melt at 650 degrees C, so if we find a migmatite where quartz has melted in a granitic rock and we know the temperature in the region increased with depth by 25 degrees C per kilometer, we could estimate the depth that the rock had been at to be about __________.

back 7

26.0 km

front 8

Confining pressure is where _________.

back 8

forces area applied equally in all directions

front 9

When rocks experience high temperatures and differential stresses deep in the Earth, their grains tend to _________.

back 9

flatten and elongate

front 10

Recrystallization during metamorphism causes grains to grow longer in the __________.

back 10

direction perpendicular to the compressional stress

front 11

Slate is _________ than shale.

back 11

denser

front 12

Which of the following is not an example of a foliation in a metamorphic rock?

back 12

bedding planes and strata

front 13

Which of the following changes may occur during metamorphism?

back 13

all the above

front 14

The common rock produced by the metamorphism of limestone is ____________.

back 14

marble

front 15

________ is composed of alternating bands of light and dark silicate minerals.

back 15

Gneiss

front 16

The primary agent of contact metamorphism is ________.

back 16

heat

front 17

Which of the following lists the rocks in the order of increasing grain size and increasing grade of metamorphism?

back 17

slate, phyllite, schist

front 18

The very large crystals of quartz, feldspar, and muscovite found in pegmatites form from

back 18

the final crystallizing parts of magma

front 19

The minerals gold, silver and mercury are often found in ________.

back 19

hydrothermal veins

front 20

List three agents of metamorphism.

back 20

heat, pressure, fluids

front 21

What type of stress (pressure) is illustrated in the diagram below?

back 21

lithostatic or confining

front 22

What type of stress (pressure) is illustrated in the diagram below?

back 22

differential press