Question 1

Geologists believe that when the thick and high part of a mountain belt becomes too high and gravitationally unstable _____ occurs.

Accepted Answer

A)  massive landslides
B)  gravitational collapse and spreading
C)  volcanic eruptions
D)  rapid downcutting
E)  basalt flows

Question 2

Seismic studies indicate that continental crust beneath mountains and cratons is essentially the same thickness.

Accepted Answer

A) True 
 B)False

Question 3

Soapstone is a metamorphic rock composed of the mineral talc.

Accepted Answer

A) True 
 B)False

Question 4

The Andes Mountains,where the South America Plate overrides the Nazca Plate,are a consequence of ocean-continent convergence.

Accepted Answer

A) True 
 B)False

Question 5

Most of the world's mountains existing today are a result of ____.

Accepted Answer

A)  intense deformation
B)  isostasy
C)  weathering and erosion
D)  intense deformation and isostasy
E)  intense deformation,isostasy,and weathering and erosion

Question 6

In some mountain belts the crust breaks into fault-bounded blocks resulting in _____ mountain ranges.

Accepted Answer

A)  fault-block
B)  extremely high
C)  extensional
D)  isostatically adjusted
E)  metamorphic

Question 7

According to the concept of isostasy,lighter,less dense,continental crust "floats" higher on the mantle than denser oceanic crust.

Accepted Answer

A) True 
 B)False

Question 8

The _____ resulted from the collision of Asia and Europe.

Accepted Answer

A)  Alps
B)  Pyrenees
C)  Caledonide Mountains
D)  Ural Mountains
E)  Himalayan Mountains

Question 9

Continents grow bigger as _______.

Accepted Answer

A)  accretionary wedges form at the margins
B)  gravitational collapse and spreading widens the craton
C)  mountain belts evolve along their margins
D)  uplift and block-faulting takes place
E)  isostacy lifts them up

Question 10

_____ is the detachment of part of the mantle portion of the lithosphere beneath a mountain belt.

Accepted Answer

A)  Delamination
B)  Mantle convection
C)  Terrane shift
D)  Isostatic adjustment
E)  Craton formation

Question 11

_____ are chains thousands of kilometers long composed of numerous mountain ranges.

Accepted Answer

A)  Mid-oceanic ridge
B)  Volcanic arcs
C)  Back arcs
D)  Valley and Ridge Province
E)  Mountain belts E

Question 12

A(n) __________ is an episode of intense deformation of the rocks of a region.

Accepted Answer

A)  isostatic adjustment
B)  geosyncline
C)  orogeny
D)  buoyancy event
E)  basin to dome event

Question 13

The Himalayan Mountains formed as the result of ______ convergence.

Accepted Answer

A)  ocean-continent
B)  arc-continent
C)  ocean-ocean
D)  arc-ocean
E)  continent-continent E

Question 14

The Appalachian Mountains are an example of ocean-ocean convergence.

Accepted Answer

A) True 
 B)False

Question 15

Frequent earthquakes are characteristic of mountain belts that are young and active.

Accepted Answer

A) True 
 B)False

Question 16

A ______ is the source of sedimentary and volcanic material accumulating along a convergent boundary.

Accepted Answer

A)  subduction zone
B)  magmatic arc
C)  suspect terrane
D)  mid-oceanic ridge
E)  folded mountain range

Question 17

At the close of the Paleozoic,eastern North America was attached to what is now _______.

Accepted Answer

A)  Europe and Asia
B)  China and South America
C)  India and Antarctica
D)  Africa and China
E)  Europe and Africa

Question 18

In the Paleozoic Era the North American continent grew westward because of the accumulation of the Cordillera.

Accepted Answer

A) True 
 B)False

Question 19

One important result of orogeny is that continental crust becomes thicker.

Accepted Answer

A) True 
 B)False  True

Question 20

The Grand Canyon,Ozark dome,Black Hills,and Adirondacks expose ________.

Accepted Answer

A)  a fold and thrust belt
B)  ophiolites
C)  a Precambrian basement
D)  an ancient magmatic arc
E)  the result of delamination

Exam 5: Mountain Belts and the Continental Crust

Geologists believe that when the thick and high part of a mountain belt becomes too high and gravitationally unstable _____ occurs.

Correct AnswerverifiedShow Answer

Seismic studies indicate that continental crust beneath mountains and cratons is essentially the same thickness.

Correct AnswerverifiedShow Answer

Soapstone is a metamorphic rock composed of the mineral talc.

Correct AnswerverifiedShow Answer

The Andes Mountains,where the South America Plate overrides the Nazca Plate,are a consequence of ocean-continent convergence.

Correct AnswerverifiedShow Answer

Most of the world's mountains existing today are a result of ____.

Correct AnswerverifiedShow Answer

In some mountain belts the crust breaks into fault-bounded blocks resulting in _____ mountain ranges.

Correct AnswerverifiedShow Answer

According to the concept of isostasy,lighter,less dense,continental crust "floats" higher on the mantle than denser oceanic crust.

Correct AnswerverifiedShow Answer

The _____ resulted from the collision of Asia and Europe.

Correct AnswerverifiedShow Answer

Continents grow bigger as _______.

Correct AnswerverifiedShow Answer

_____ is the detachment of part of the mantle portion of the lithosphere beneath a mountain belt.

Correct AnswerverifiedShow Answer

_____ are chains thousands of kilometers long composed of numerous mountain ranges.

Correct AnswerverifiedE

A(n) __________ is an episode of intense deformation of the rocks of a region.

Correct AnswerverifiedShow Answer

The Himalayan Mountains formed as the result of ______ convergence.

Correct AnswerverifiedE

The Appalachian Mountains are an example of ocean-ocean convergence.

Correct AnswerverifiedShow Answer

Frequent earthquakes are characteristic of mountain belts that are young and active.

Correct AnswerverifiedShow Answer

A ______ is the source of sedimentary and volcanic material accumulating along a convergent boundary.

Correct AnswerverifiedShow Answer

At the close of the Paleozoic,eastern North America was attached to what is now _______.

Correct AnswerverifiedShow Answer

In the Paleozoic Era the North American continent grew westward because of the accumulation of the Cordillera.

Correct AnswerverifiedShow Answer

One important result of orogeny is that continental crust becomes thicker.

Correct AnswerverifiedTrue

The Grand Canyon,Ozark dome,Black Hills,and Adirondacks expose ________.

Correct AnswerverifiedShow Answer

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E

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E

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True

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