Question 1

A change in the angle of plate subduction usually reflects a change in the

Accepted Answer

A)   rate of oceanic sedimentation on the plate.
B)   rate of movement of the crustal plate.
C)   volume of melted material rising to the surface over time.
D)   increasing height of a volcanic mountain chain.E) A) and C)
F) A) and B)

Question 2

The oldest rocks of the Michigan Basin are __________, and these are found at the Earth's surface __________.

Accepted Answer

A)   Pennsylvania; on the outer edges of the basin.
B)   Jurassic; at the center of the basin
C)   Precambrian; on the outer edges of the basin
D)   Silurian; at the center of the basinE) A) and D)
F) C) and D)

Question 3

The age of eastern African rift valleys is

Accepted Answer

A)   Cenozoic.
B)   Mesozoic.
C)   Paleozoic.
D)   Precambrian.E) A) and D)
F) A) and B)

Question 4

_________ is the name given to microcontinents that have attached themselves to larger landmasses, especially the western part of North America.

Accepted Answer

A)   Exotic terranes
B)   Structural basins
C)   Structural domes
D)   Thrust beltsE) B) and C)
F) A) and D) A

Question 5

__________ is the line of intersection between the axial plane and the beds of folded rock.

Accepted Answer

A)   Axis of a fold
B)   Regional strike
C)   Axial plane
D)   Regional dipE) All of the above
F) B) and C)

Question 6

The onset of deposition of molasse sediments in the foreland basin indicates that

Accepted Answer

A)   accumulation of sediment has pushed away the foreland basin sea.
B)   the mountain chain has worn down and isostatic uplift has begun.
C)   the moving continent has stalled at the subduction zone.
D)   a deep foreland basin is starting to form and the sea has filled the basin.E) All of the above
F) None of the above

Question 7

Synclines are characterized by layers that

Accepted Answer

A)   are concave upward.
B)   are concave downward.
C)   include a high proportion of shales and sandstones.
D)   include a high proportion of sandstones and limestones.E) A) and B)
F) B) and D)

Question 8

Select the characteristic below that is NOT consistent with continental rifting.

Accepted Answer

A)   Mafic and felsic igneous rocks, including dikes and sills.
B)   Thick sedimentary sequences within fault block basins, including lake deposits.
C)   Multiple thrust faults and other compression features.
D)   Coarse terrestrial deposits and evaporites overlain by oceanic sediments.E) A) and C)
F) All of the above

Question 9

On any given tilted bed, strike and dip are

Accepted Answer

A)   parallel to one another.
B)   perpendicular to one another.
C)   at some large angle to one another, but not 90 degrees (greater than 90 degrees) .
D)   at some small angle to one another, but not 90 degrees (less than 90 degrees) .E) None of the above
F) A) and D)

Question 10

Marine sediment lying above evaporate deposits beneath the Red Sea shows us that the

Accepted Answer

A)   Red Sea is slowing drying up.
B)   Red Sea is the failed arm of a triple junction.
C)   Indian Ocean once covered a large part of northern Africa.
D)   Indian Ocean has only recently gained access to the widening Red Sea.E) None of the above
F) A) and B)

Question 11

Deep-seated crustal faults dating from Proterozoic may have caused powerful earthquakes with epicenters in __________ during 1811-1812.

Accepted Answer

A)   Michigan
B)   Missouri
C)   Mississippi
D)   MontanaE) A) and C)
F) C) and D) B

Question 12

Two of the westernmost structural basins of the United States are named

Accepted Answer

A)   Williston and Permian.
B)   Anadarko and Forest City.
C)   Michigan and Illinois.
D)   Appalachian and Michigan.E) A) and C)
F) All of the above

Question 13

The Black Hills of South Dakota are an example of a

Accepted Answer

A)   metamorphic belt.
B)   fault zone.
C)   structural dome.
D)   structural basin.E) A) and C)
F) A) and B) C

Question 14

A failed rift is oriented roughly

Accepted Answer

A)   perpendicular to a deep valley that holds a very large river.
B)   parallel to the long dimension of the newly opened ocean.
C)   parallel to the rifted margin of the broken continent.
D)   perpendicular to the rifted margin of the broken continent.E) A) and B)
F) B) and C)

Question 15

During __________, a long seaway occupied the foreland basin to the east of the Andes Mountains.

Accepted Answer

A)   Paleocene
B)   Miocene
C)   Oligocene
D)   EoceneE) None of the above
F) B) and C)

Question 16

Typically, active margins are characterized by

Accepted Answer

A)   subsidence below sea level and tectonic inactivity.
B)   tectonic deformation and igneous activity.
C)   great thicknesses of undisturbed sediment.
D)   continuous subsidence under the weight of added sediment.E) None of the above
F) A) and B)

Question 17

In eastern South America (Brazil) , at shallow depths underlying the sedimentary deposits of the Amazon River, there are

Accepted Answer

A)   sedimentary deposits of an inland sea.
B)   igneous rocks of the Andes volcanoes.
C)   thick sedimentary deposits of flysch and molasse.
D)   Atlantic sea floor sediments such as shale and chert.E) A) and D)
F) All of the above

Question 18

The present process of mountain- building in the Andes began during

Accepted Answer

A)   Cenozoic.
B)   Mesozoic.
C)   Paleozoic.
D)   Precambrian.E) A) and D)
F) B) and C)

Question 19

The brief time span during Cretaceous when this mountain range formed was NOT long enough to produce any igneous rocks.

Accepted Answer

A)   Appalachians
B)   Black Hills
C)   PyrennesPyrenees
D)   AndesE) A) and B)
F) A) and C)

Question 20

__________ is the process of mountain building.

Accepted Answer

A)   Suturing
B)   Orogenesis
C)   Ophiolite
D)   SubductionE) B) and D)
F) A) and C)

Exam 9: Continental Tectonics and Mountain Chains

A change in the angle of plate subduction usually reflects a change in the

Correct AnswerverifiedShow Answer

The oldest rocks of the Michigan Basin are __________, and these are found at the Earth's surface __________.

Correct AnswerverifiedShow Answer

The age of eastern African rift valleys is

Correct AnswerverifiedShow Answer

_________ is the name given to microcontinents that have attached themselves to larger landmasses, especially the western part of North America.

Correct AnswerverifiedA

__________ is the line of intersection between the axial plane and the beds of folded rock.

Correct AnswerverifiedShow Answer

The onset of deposition of molasse sediments in the foreland basin indicates that

Correct AnswerverifiedShow Answer

Synclines are characterized by layers that

Correct AnswerverifiedShow Answer

Select the characteristic below that is NOT consistent with continental rifting.

Correct AnswerverifiedShow Answer

On any given tilted bed, strike and dip are

Correct AnswerverifiedShow Answer

Marine sediment lying above evaporate deposits beneath the Red Sea shows us that the

Correct AnswerverifiedShow Answer

Deep-seated crustal faults dating from Proterozoic may have caused powerful earthquakes with epicenters in __________ during 1811-1812.

Correct AnswerverifiedB

Two of the westernmost structural basins of the United States are named

Correct AnswerverifiedShow Answer

The Black Hills of South Dakota are an example of a

Correct AnswerverifiedC

A failed rift is oriented roughly

Correct AnswerverifiedShow Answer

During __________, a long seaway occupied the foreland basin to the east of the Andes Mountains.

Correct AnswerverifiedShow Answer

Typically, active margins are characterized by

Correct AnswerverifiedShow Answer

In eastern South America (Brazil) , at shallow depths underlying the sedimentary deposits of the Amazon River, there are

Correct AnswerverifiedShow Answer

The present process of mountain- building in the Andes began during

Correct AnswerverifiedShow Answer

The brief time span during Cretaceous when this mountain range formed was NOT long enough to produce any igneous rocks.

Correct AnswerverifiedShow Answer

__________ is the process of mountain building.

Correct AnswerverifiedShow Answer

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The oldest rocks of the Michigan Basin are , and these are found at the Earth's surface .

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A

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B

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C

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