Question 1

________ are planar extensional structures which thin the crust in response to horizontally directed, tensional stresses.

Accepted Answer

A)  Normal faults
B)  Anticlines
C)  Reverse faults
D)  Thrust faultsE) A) and D)
F) B) and C)

Question 2

A graben is characterized by ________.

Accepted Answer

A)  a hanging wall block that has moved up between two reverse faults
B)  a footwall block that has moved up between two normal faults
C)  a hanging wall block that has moved down between two normal faults
D)  a footwall block that has moved down between two reverse faultsE) All of the above
F) None of the above

Question 3

When measuring the orientation of a planar structure in rocks the dip direction is measured ________ to the strike.

Accepted Answer

A)  at 90 degrees
B)  parallel
C)  backwards
D)  sidewaysE) None of the above
F) B) and C)

Question 4

In a thrust fault, the hanging wall moves ________ relative to the footwall and the fault plane is oriented at a ________ angle.

Accepted Answer

The answer of In a thrust fault, the hanging wall...

Question 5

What is a fault?

Accepted Answer

A brittle fracture i...

Question 6

What are hogbacks?

Accepted Answer

steeply inclined res...

Question 7

A horst is ________.

Accepted Answer

A)  an uplifted block bounded by two normal faults
B)  a downdropped block bounded by two reverse faults
C)  an uplifted block bounded by two reverse faults
D)  an inflexible square head surrounded by immovable faultsE) B) and D)
F) A) and D)

Question 8

Which one of the following statements regarding rock deformation and strength is correct?

Accepted Answer

A)  Rupture and plastic deformation occur when stresses and strain rates exceed the elastic limit of a material.
B)  Rocks undergo plastic deformation less readily as temperatures and pressures increase.
C)  Elastic deformation is accomplished through internal flow of material.
D)  When rocks are subjected to stress for long time spans, very small, plastic deformations accumulate to produce large, permanent, elastic deformations.E) B) and C)
F) None of the above

Question 9

A syncline is ________.

Accepted Answer

A)  a fold in which the older central strata dip away from the axis
B)  a fold with only one limb
C)  a fold in which older flanking strata dip toward the axis
D)  a paralytic drunken fold characterized by recumbent limbsE) C) and D)
F) All of the above

Question 10

Rocks that display contorted folds and other evidence of ductile flow usually were deformed at great depth.

Accepted Answer

A) True 
 B)False

Question 11

Name an economic resource associated with geologic structures.

Accepted Answer

oil and gas deposits or bedroc...

Question 12

Most faults are inactive and stand as geologic evidence of past structural deformation.

Accepted Answer

A) True 
 B)False

Question 13

What is the cause of most earthquakes?

Accepted Answer

A)  folding deep under active mountain belts
B)  nuclear weapons tests in secret underground locations
C)  sudden movements from elastic strain release and rupture along pre-existing faults on or near to plate boundaries
D)  volcanic eruptionsE) B) and C)
F) None of the above

Question 14

A(n)________ has the strata on both limbs dipping away (outward from)the axis.

Accepted Answer

The answer of A(n)________ has the strata on both limbs...

Question 15

Normal faults form in response to horizontal, tensional stresses that stretch or elongate the rocks.

Accepted Answer

A) True 
 B)False

Question 16

Describe the most common way for a monocline to form.

Accepted Answer

a single sided drape...

Question 17

Horizontal, compressive deformation involves shortening and thickening of the crust.

Accepted Answer

A) True 
 B)False

Question 18

The two sides of a fold are called its lobes.

Accepted Answer

A) True 
 B)False

Question 19

Igneous and metamorphic rocks exposed in the "stable" interiors of continents have necessarily been uplifted from much deeper levels in the Earth's crust.

Accepted Answer

A) True 
 B)False

Question 20

Are horsts and grabens bounded by normal or reverse faults?

Accepted Answer

The answer of Are horsts and grabens bounded by normal...

Exam 9: Crustal Deformation

In a thrust fault, the hanging wall moves ________ relative to the footwall and the fault plane is oriented at a ________ angle.

Correct AnswerverifiedShow Answer

A horst is ________.

Correct AnswerverifiedShow Answer

________ are planar extensional structures which thin the crust in response to horizontally directed, tensional stresses.

Correct AnswerverifiedShow Answer

Normal faults form in response to horizontal, tensional stresses that stretch or elongate the rocks.

Correct AnswerverifiedShow Answer

Name an economic resource associated with geologic structures.

Correct Answerverifiedoil and gas deposits or bedroc...View AnswerShow Answer

Are horsts and grabens bounded by normal or reverse faults?

Correct AnswerverifiedShow Answer

A(n)________ has the strata on both limbs dipping away (outward from)the axis.

Correct AnswerverifiedShow Answer

Most faults are inactive and stand as geologic evidence of past structural deformation.

Correct AnswerverifiedShow Answer

Horizontal, compressive deformation involves shortening and thickening of the crust.

Correct AnswerverifiedShow Answer

Igneous and metamorphic rocks exposed in the "stable" interiors of continents have necessarily been uplifted from much deeper levels in the Earth's crust.

Correct AnswerverifiedShow Answer

When measuring the orientation of a planar structure in rocks the dip direction is measured ________ to the strike.

Correct AnswerverifiedShow Answer

What are hogbacks?

Correct Answerverifiedsteeply inclined res...View AnswerShow Answer

Which one of the following statements regarding rock deformation and strength is correct?

Correct AnswerverifiedShow Answer

Rocks that display contorted folds and other evidence of ductile flow usually were deformed at great depth.

Correct AnswerverifiedShow Answer

A syncline is ________.

Correct AnswerverifiedShow Answer

What is a fault?

Correct AnswerverifiedA brittle fracture i...View AnswerShow Answer

A graben is characterized by ________.

Correct AnswerverifiedShow Answer

The two sides of a fold are called its lobes.

Correct AnswerverifiedShow Answer

Describe the most common way for a monocline to form.

Correct Answerverifieda single sided drape...View AnswerShow Answer

What is the cause of most earthquakes?

Correct AnswerverifiedShow Answer

In a thrust fault, the hanging wall moves relative to the footwall and the fault plane is oriented at a angle.

Correct Answer
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oil and gas deposits or bedroc...
View Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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steeply inclined res...
View Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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A brittle fracture i...
View Answer

Correct Answer
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Correct Answer
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Correct Answer
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a single sided drape...
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Correct Answer
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