Question 1

A mineral's melting point generally increases with increasing pressure.

Accepted Answer

A) True 
 B)False

Question 2

An ultramafic rock is composed almost entirely of quartz.

Accepted Answer

A) True 
 B)False

Question 3

A dike is a discordant intrusive igneous structure.

Accepted Answer

A) True 
 B)False

Question 4

A pluton is an igneous structure that crystallized at very shallow depths.

Accepted Answer

A) True 
 B)False

Question 5

Igneous rock names are based on grain shape and chemical composition.

Accepted Answer

A) True 
 B)False

Question 6

Geologists regard basaltic magma (Hawaiian lava, for example)  as the result of the partial melting of ultramafic rock in the ____.

Accepted Answer

A)   oceanic crust
B)   continental crust
C)   mantle
D)   outer core
E)   inner core C

Question 7

Rhyolite is considerably more common than granite.

Accepted Answer

A) True 
 B)False

Question 8

Lava is magma on the Earth's surface.

Accepted Answer

A) True 
 B)False

Question 9

Granite and ______ are composed predominantly of feldspar and quartz.

Accepted Answer

A)   oceanic crust
B)   diorite
C)   basalt
D)   rhyolite
E)   ultramafics

Question 10

Mafic magma generated in the _______ rises to the base of the crust.

Accepted Answer

A)   continental crust
B)   outer core
C)   asthenosphere
D)   spreading ridges
E)   mantle plumes C

Question 11

Ultramafic igneous rocks are composed almost entirely of __.

Accepted Answer

A)   feldspar
B)   quartz
C)   ferromagnesian minerals
D)   calcite
E)   diamonds C

Question 12

Mafic igneous rocks are silica-poor.

Accepted Answer

A) True 
 B)False

Question 13

Viscosity is a property of a fluid that relates to how easily the fluid flows. A material that is viscous __.

Accepted Answer

A)   flows easily
B)   flows less easily
C)   is always hot
D)   is always a solid
E)   is always cold

Question 14

The geothermal gradient is the rate at which pressure increases with increasing depth beneath the surface.

Accepted Answer

A) True 
 B)False

Question 15

What is the sequence of crystallization along the discontinuous branch of Bowen's reaction series?

Accepted Answer

A)   sodium-rich to calcium-rich plagioclase
B)   quartz, potassium feldspar, biotite
C)   silicic, felsic, mafic, intermediate
D)   olivine, pyroxene, amphibole, biotite
E)   framework, double chain, single chain, sheet, isolated

Question 16

______ are fragments of country rock that are distinct from the body of igneous rocks in which they are enclosed.

Accepted Answer

A)   Clasts
B)   Chill zones
C)   Phenocrysts
D)   Xenoliths
E)   Necks

Question 17

The term mafic comes from the terms magnesium and ferric.

Accepted Answer

A) True 
 B)False

Question 18

Although batholiths may contain mafic and intermediate rocks, they almost never composed of granite.

Accepted Answer

A) True 
 B)False

Question 19

Igneous rocks may be either ____ if they form on or near Earth's surface, or ___ if they solidify under ground.

Accepted Answer

A)   intrusive; volcanic
B)   volcanic; extrusive
C)   extrusive; intrusive
D)   plutonic; intrusive
E)   intrusive; extrusive

Question 20

_____ rocks have coarse crystals in a fine-grained matrix.

Accepted Answer

A)   Ultramafic
B)   Granite
C)   Sill
D)   Pegmatite
E)   Porphyritic

Exam 3: Igneous Rocks, Intrusive Activity, and the Origin of Igneous Rocks

A mineral's melting point generally increases with increasing pressure.

Correct AnswerverifiedShow Answer

An ultramafic rock is composed almost entirely of quartz.

Correct AnswerverifiedShow Answer

A dike is a discordant intrusive igneous structure.

Correct AnswerverifiedShow Answer

A pluton is an igneous structure that crystallized at very shallow depths.

Correct AnswerverifiedShow Answer

Igneous rock names are based on grain shape and chemical composition.

Correct AnswerverifiedShow Answer

Geologists regard basaltic magma (Hawaiian lava, for example) as the result of the partial melting of ultramafic rock in the ____.

Correct AnswerverifiedC

Rhyolite is considerably more common than granite.

Correct AnswerverifiedShow Answer

Lava is magma on the Earth's surface.

Correct AnswerverifiedShow Answer

Granite and ______ are composed predominantly of feldspar and quartz.

Correct AnswerverifiedShow Answer

Mafic magma generated in the _______ rises to the base of the crust.

Correct AnswerverifiedC

Ultramafic igneous rocks are composed almost entirely of __.

Correct AnswerverifiedC

Mafic igneous rocks are silica-poor.

Correct AnswerverifiedShow Answer

Viscosity is a property of a fluid that relates to how easily the fluid flows. A material that is viscous __.

Correct AnswerverifiedShow Answer

The geothermal gradient is the rate at which pressure increases with increasing depth beneath the surface.

Correct AnswerverifiedShow Answer

What is the sequence of crystallization along the discontinuous branch of Bowen's reaction series?

Correct AnswerverifiedShow Answer

______ are fragments of country rock that are distinct from the body of igneous rocks in which they are enclosed.

Correct AnswerverifiedShow Answer

The term mafic comes from the terms magnesium and ferric.

Correct AnswerverifiedShow Answer

Although batholiths may contain mafic and intermediate rocks, they almost never composed of granite.

Correct AnswerverifiedShow Answer

Igneous rocks may be either ____ if they form on or near Earth's surface, or ___ if they solidify under ground.

Correct AnswerverifiedShow Answer

_____ rocks have coarse crystals in a fine-grained matrix.

Correct AnswerverifiedShow Answer

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C

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C

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Igneous rocks may be either __ if they form on or near Earth's surface, or _ if they solidify under ground.

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