Question 1

Chunks of rocks that break off from country rocks and fall into magmas are called

Accepted Answer

A) wall rocks. 
B) xenoliths. 
C) country rocks. 
D) foreign rocks. 
A) wall rocks. 
B) xenoliths. 
C) country rocks. 
D) foreign rocks.

Question 2

Magma is,by definition,

Accepted Answer

A) molten rock ejected into the air. 
B) solid rock ejected into the air. 
C) molten rock below the surface. 
D) molten rock on the surface. 
A) molten rock ejected into the air. 
B) solid rock ejected into the air. 
C) molten rock below the surface. 
D) molten rock on the surface.

Question 3

Which of the following igneous rocks does not consist of volcanic glass?

Accepted Answer

A) ash 
B) gabbro 
C) obsidian 
D) pumice 
A) ash 
B) gabbro 
C) obsidian 
D) pumice

Question 4

Which of the following describes an ophiolite suite,beginning at the base?

Accepted Answer

A) peridotite,gabbro,sheeted dikes,pillow basalt,sediments 
B) gabbro,peridotite,sheeted dikes,sediments,pillow basalt 
C) pillow basalt,sheeted dikes,gabbro,peridotite,sediments 
D) sediments,pillow basalt,gabbro,peridotite,sheeted dikes 
A) peridotite,gabbro,sheeted dikes,pillow basalt,sediments 
B) gabbro,peridotite,sheeted dikes,sediments,pillow basalt 
C) pillow basalt,sheeted dikes,gabbro,peridotite,sediments 
D) sediments,pillow basalt,gabbro,peridotite,sheeted dikes

Question 5

Which of the following rocks is a volcanic rock made up of lithified pyroclastic material?

Accepted Answer

A) basalt 
B) granodiorite 
C) obsidian 
D) tuff 
A) basalt 
B) granodiorite 
C) obsidian 
D) tuff

Question 6

Which of the following igneous rocks has the same chemical composition as basalt?

Accepted Answer

A) andesite 
B) diorite 
C) gabbro 
D) rhyolite 
A) andesite 
B) diorite 
C) gabbro 
D) rhyolite

Question 7

What is the overall composition of the Palisades sill located near New York?

Accepted Answer

A) felsic 
B) intermediate 
C) mafic 
D) ultramafic 
A) felsic 
B) intermediate 
C) mafic 
D) ultramafic

Question 8

Which of the following properties does not depend on the chemical composition of an igneous rock/magma?

Accepted Answer

A) grain size 
B) melting temperature 
C) mineralogy 
D) viscosity 
A) grain size 
B) melting temperature 
C) mineralogy 
D) viscosity

Question 9

What is the origin of the word "felsic" in the context of igneous rock classification?

Accepted Answer

A) iron (Fe)and silica (SiO2) 
B) feldspar and silica 
C) iron and magnesium (Mg) 
D) It means "light" colored. 
A) iron (Fe)and silica (SiO2) 
B) feldspar and silica 
C) iron and magnesium (Mg) 
D) It means "light" colored.

Question 10

Magmas fall into one of the following groups:

Accepted Answer

A) felsic,mafic or intermediate 
B) mafic or intermediate 
C) intermediate or felsic 
D) extrusive or intrusive 
A) felsic,mafic or intermediate 
B) mafic or intermediate 
C) intermediate or felsic 
D) extrusive or intrusive

Question 11

What type of magma forms at mid-ocean ridges?

Accepted Answer

A) felsic 
B) intermediate 
C) mafic 
D) ultramafic 
A) felsic 
B) intermediate 
C) mafic 
D) ultramafic

Question 12

Which of the following best describes an andesite?

Accepted Answer

A) a coarse-grained,intermediate igneous rock 
B) a fine-grained,intermediate igneous rock 
C) a coarse-grained,felsic igneous rock 
D) a fine-grained,felsic igneous rock 
A) a coarse-grained,intermediate igneous rock 
B) a fine-grained,intermediate igneous rock 
C) a coarse-grained,felsic igneous rock 
D) a fine-grained,felsic igneous rock

Question 13

Which of the following minerals does not normally occur in basalt?

Accepted Answer

A) olivine 
B) pyroxene 
C) plagioclase feldspar 
D) quartz 
A) olivine 
B) pyroxene 
C) plagioclase feldspar 
D) quartz

Question 14

When equal amounts of a basaltic and granitic magma mix,the resulting magma is

Accepted Answer

A) mafic. 
B) basaltic. 
C) felsic. 
D) andesitic. 
A) mafic. 
B) basaltic. 
C) felsic. 
D) andesitic.

Question 15

Which igneous rock was used by Native Americans to produce arrowheads?

Accepted Answer

A) granite 
B) ophiolite 
C) basalt 
D) obsidian 
A) granite 
B) ophiolite 
C) basalt 
D) obsidian

Question 16

Which of the following tectonic settings has the greatest range in magma compositions?

Accepted Answer

A) convergent plate boundaries 
B) transform plate boundaries 
C) divergent plate boundaries 
D) hot spots (mantle plumes) 
A) convergent plate boundaries 
B) transform plate boundaries 
C) divergent plate boundaries 
D) hot spots (mantle plumes)

Question 17

Ultramafic lava flows are relatively uncommon.Why is that?

Accepted Answer

A) They are rarely generated in the mantle. 
B) They have a high melting point and the crustal temperature is too low. 
C) They are high density and therefore do not rise in the mantle. 
D) They have high viscosity like felsic melts. 
A) They are rarely generated in the mantle. 
B) They have a high melting point and the crustal temperature is too low. 
C) They are high density and therefore do not rise in the mantle. 
D) They have high viscosity like felsic melts.

Question 18

Where would you expect to find the largest crystals in a lava flow?

Accepted Answer

A) near the top surface of the flow 
B) near or just below the center of the flow 
C) near the bottom surface of the flow 
D) throughout the flow 
A) near the top surface of the flow 
B) near or just below the center of the flow 
C) near the bottom surface of the flow 
D) throughout the flow

Question 19

Which of the following minerals crystallizes from a magma at the lowest temperature?

Accepted Answer

A) calcium-rich feldspar 
B) olivine 
C) pyroxene 
D) quartz 
A) calcium-rich feldspar 
B) olivine 
C) pyroxene 
D) quartz

Question 20

The classification of igneous rocks is dependent on texture and

Accepted Answer

A) the relative proportion of silicate minerals. 
B) the relative proportion of pyroclastic material. 
C) the relative proportion of phenocryst minerals. 
D) the relative proportion of vesicles. 
A) the relative proportion of silicate minerals. 
B) the relative proportion of pyroclastic material. 
C) the relative proportion of phenocryst minerals. 
D) the relative proportion of vesicles.

Exam 4: Igneous Rocks: Solids From Melts

Chunks of rocks that break off from country rocks and fall into magmas are called

Magma is,by definition,

Which of the following igneous rocks does not consist of volcanic glass?

Which of the following describes an ophiolite suite,beginning at the base?

Which of the following rocks is a volcanic rock made up of lithified pyroclastic material?

Which of the following igneous rocks has the same chemical composition as basalt?

What is the overall composition of the Palisades sill located near New York?

Which of the following properties does not depend on the chemical composition of an igneous rock/magma?

What is the origin of the word "felsic" in the context of igneous rock classification?

Magmas fall into one of the following groups:

What type of magma forms at mid-ocean ridges?

Which of the following best describes an andesite?

Which of the following minerals does not normally occur in basalt?

When equal amounts of a basaltic and granitic magma mix,the resulting magma is

Which igneous rock was used by Native Americans to produce arrowheads?

Which of the following tectonic settings has the greatest range in magma compositions?

Ultramafic lava flows are relatively uncommon.Why is that?

Where would you expect to find the largest crystals in a lava flow?

Which of the following minerals crystallizes from a magma at the lowest temperature?

The classification of igneous rocks is dependent on texture and

The Earth System

Plate Tectonics: The Unifying Theory

Earth Materials: Minerals and Rocks

Sedimentation: Rocks Formed by Surface Processes

Metamorphism: Alteration of Rocks by Temperature and Pressure

Deformation: Modification of Rocks by Folding and Fracturing

Clocks in Rocks: Timing the Geologic Period

Early History of the Terrestrial Planets

History of the Continents

Geobiology: Life Interacts With Earth

Volcanoes

Earthquakes

Exploring Earths Interior

The Climate System

Weathering,erosion,and Mass Wasting: Interactions Between the Climate and Plate Tectonic Systems

The Hydrologic Cycle and Groundwater

Stream Transport: From Mountains to Oceans

Winds and Deserts

Coastlines and Ocean Basins

Glaciers: the Work of Ice

Landscapes: Tectonic and Climate Interaction

The Human Impact of Earths Environment

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