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Physical Geology, 8/e
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Igneous Rocks, Intrusive Activity, and the Origin of Igneous Rocks

Multiple Choice Quiz

For each question below, choose the letter corresponding to the BEST answer.



1

A surface separating different types of rocks is called
A)a chill zone.
B)a xenolith.
C)a contact.
D)none of the above
2

The major difference between volcanic and plutonic igneous rocks is
A)the type of minerals they contain.
B)where they solidify.
C)their chemical composition.
D)all of the above
3

Which is not a fine-grained rock type?
A)granite
B)andesite
C)basalt
D)rhyolite
4

By definition, stocks differ from batholiths in
A)elevation above sea level.
B)chemical composition.
C)shape.
D)size.
5

Fragments of country rock that are distinct from the body of igneous rocks in which they are enclosed
A)meteorites.
B)xenoliths.
C)exoliths.
D)lithographs.
6

Which of the following minerals is part of Bowen's Continuous Series?
A)olivine
B)amphibole
C)biotite
D)none of these are part of the continuous series
7

Which of the following minerals is part of Bowen's Discontinuous Series?
A)olivine
B)biotite
C)pyroxene
D)all of these are part of Bowen's Discontinuous Series
8

The difference in minerals among plutonic rocks is caused by
A)different chemical compositions.
B)different crystallization temperatures.
C)magmatic differentiation.
D)all of these
9

A change in magma composition due to melting of surrounding country rock is called
A)differentiation.
B)crystal settling.
C)magma mixing.
D)none of these
10

Basalt is most often associated with what type of plate boundary?
A)reversible plate boundaries
B)convergent plate boundaries
C)transform plate boundaries
D)divergent plate boundaries
11

You discover a rock with minerals large enough to be seen containing potassium feldspar, muscovite, and quartz. This is
A)hornblende.
B)granite.
C)gabbro.
D)diorite.
12

Bowen’s Reaction Series illustrates relations between
A)temperature, pressure, and viscosity.
B)viscosity, temperature, silica content, and volatile content.
C)temperature, chemical composition, and mineral structure.
D)temperature, viscosity, and mineral composition.
13

The two important criteria used for igneous rock classification are
A)texture and mineral composition.
B)temperature and viscosity.
C)mineral composition and temperature.
D)texture and temperature.
14

Andesite and diorite
A)formed from magma with the same silica content.
B)formed from magma with the same temperature.
C)have the same minerals.
D)all of these
15

A rock with mineral crystals too small to be seen and low temperature minerals is
A)granite.
B)andesite.
C)rhyolite.
D)gabbro.
16

Igneous rocks that form entirely beneath Earth's surface are said to be
A)platonic.
B)plutonic.
C)extrusive.
D)volcanic.
17

Andesite was named for a rock type commonly found
A)in Mayberry, North Carolina.
B)in the Andes Mountains.
C)in Hawaii.
D)in the Rocky Mountains.
18

Igneous processes are those which relate to
A)solidification of magma.
B)formation of magma.
C)melting of rocks.
D)all of these
19

The geothermal gradient of the asthenosphere is
A)always changing as a result of plate tectonics.
B)the reverse of the geothermal gradient in the lithosphere.
C)less than that of the lithosphere.
D)the same as the temperature structure of the lithosphere.
20

Volcanic rocks are also
A)explosive.
B)extrusive.
C)plutonic.
D)intrusive.