Metamorphic Rocks Practice Exam Flashcards


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1

Metamorphism occurs when a rock ___________.

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

2

The low grade metamorphism of shale produces ________.

slate

3

Mountain building causes metamorphism because __________.

all the above

4

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

heat

5

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

driving chemical reactions that head to recrystallization

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 __________.

100 degrees C

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 __________.

26.0 km

8

Confining pressure is where _________.

forces area applied equally in all directions

9

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

flatten and elongate

10

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

direction perpendicular to the compressional stress

11

Slate is _________ than shale.

denser

12

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

bedding planes and strata

13

Which of the following changes may occur during metamorphism?

all the above

14

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

marble

15

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

Gneiss

16

The primary agent of contact metamorphism is ________.

heat

17

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

slate, phyllite, schist

18

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

the final crystallizing parts of magma

19

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

hydrothermal veins

20

List three agents of metamorphism.

heat, pressure, fluids

21

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

lithostatic or confining

22

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

differential press