Question 1

On this map of the South Atlantic, which letter is on a site of seafloor spreading?

Accepted Answer

A)   A
B)   B
C)   C
D)   D
E)   E

Question 2

What is the underlying geologic explanation for why western South America is so different from eastern South America?

Accepted Answer

A)   The western side is a plate boundary and the eastern side is not.
B)   The eastern side is a plate boundary and the western side is not.
C)   The western side marks a plate divergence and the eastern side marks a plate convergence.

Question 3

What causes magnetic stripes on the seafloor, such as those shown here?

Accepted Answer

A)   Volcanic rocks in oceanic crust are covered by a variable thickness of sediment.
B)   Some oceanic crust consists of volcanic rocks and some is composed of sediment.
C)   Sometimes Earth's magnetic field points north and sometimes it points south.
D)   Some volcanic rocks are formed in normal ways and others have pillows.

Question 4

Which of the following features is present on the seafloor off the Pacific Northwest?

Accepted Answer

A)   world's largest oceanic plateau
B)   long, fairly straight fracture zone
C)   world's largest linear island chain
D)   island arc within oceanic plates

Question 5

Intense geologic activity occurs at plate:

Accepted Answer

A)   boundaries
B)   centers
C)   bottoms

Question 6

This figure shows plate boundaries south of Alaska. Which location is on a transform boundary?

Accepted Answer

A)   1
B)   2
C)   3
D)   4
E)   2 and 3

Question 7

Mid-ocean ridges are higher than surrounding oceanic crust primarily because:

Accepted Answer

A)   two plates are colliding
B)   the crust is thicker
C)   the crust is stronger
D)   transform faulting uplifts the rocks
E)   the lithosphere is thinner and hotter

Question 8

Which location on this figure from the Investigation is located on the abyssal plain?

Accepted Answer

A)   1
B)   2
C)   3
D)   4
E)   5

Question 9

Convergence of two ocean plates forms an ocean-ocean:

Accepted Answer

A)   convergent boundary
B)   divergent boundary
C)   transform boundary

Question 10

A divergent plate boundary is most likely associated with an) :

Accepted Answer

A)   oceanic trench
B)   mountain belt or island arc
C)   mid-ocean ridge
D)   none of these

Question 11

On the accompanying figure, what type of feature is located in the area of number 2?

Accepted Answer

A)   transform fault
B)   mid-ocean ridge
C)   linear island chain
D)   fracture zone

Question 12

Which of the following best represents the sequence by which a continent splits apart?

Accepted Answer

A)   seafloor spreading, then continental rifting, then uplift due to mantle upwelling
B)   continental rifting, then seafloor spreading, then uplift due to mantle upwelling
C)   uplift due to mantle upwelling, then continental rifting, then seafloor spreading
D)   none of these

Question 13

As two oceanic plates diverge at mid-ocean ridges, melting of the rising mantle occurs due to:

Accepted Answer

A)   decompression
B)   the addition of heat
C)   the addition of water

Question 14

Broad symmetrical ridges that cross ocean basins are called:

Accepted Answer

A)   mid-ocean ridges
B)   abyssal plains
C)   seamounts
D)   island chains

Question 15

What types of plate boundaries are shown in this figure?

Accepted Answer

A)   divergent
B)   convergent
C)   transform
D)   divergent and transform
E)   convergent and divergent

Question 16

Mantle convection involves the asthenosphere moving upward due to its lower:

Accepted Answer

A)   density
B)   temperature
C)   mineral content

Question 17

On this map, identify which letter is over the Pacific Ocean.

Accepted Answer

A)   A
B)   B
C)   C
D)   D
E)   feature is not labeled

Question 18

What is associated with reversed magnetic polarity?

Accepted Answer

A)   a compass needle would point south
B)   the magnetic signal of seafloor formed with this polarity would be stronger compared to adjacent areas of the seafloor
C)   there are much fewer intervals of reversed polarity than normal polarity
D)   all of these

Question 19

Why does the Tibetan Plateau, shown in this figure, have a high elevation?

Accepted Answer

A)   transform faulting
B)   seafloor spreading
C)   continental rifting
D)   continental collision
E)   hot-spot activity

Question 20

Island chains and seamounts cross parts of the ocean floor. These oceanic islands and associated seamounts are:

Accepted Answer

A)   different in character and origin from curved island arcs
B)   the same in character but different in origin from curved island arcs
C)   different in character but the same in origin from curved island arcs

Exam 3: Plate Tectonics

What is associated with reversed magnetic polarity?

Correct Answer
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Which location on this figure from the Investigation is located on the abyssal plain?

Correct Answer
verified

Mantle convection involves the asthenosphere moving upward due to its lower:

Correct Answer
verified

On the accompanying figure, what type of feature is located in the area of number 2? $On the accompanying figure, what type of feature is located in the area of number 2? A) transform fault B) mid-ocean ridge C) linear island chain D) fracture zone$

Correct Answer
verified

This figure shows plate boundaries south of Alaska. Which location is on a transform boundary?

Correct Answer
verified

Why does the Tibetan Plateau, shown in this figure, have a high elevation?

Correct Answer
verified

Mid-ocean ridges are higher than surrounding oceanic crust primarily because:

Correct Answer
verified

What is the underlying geologic explanation for why western South America is so different from eastern South America?

Correct Answer
verified

Island chains and seamounts cross parts of the ocean floor. These oceanic islands and associated seamounts are:

Correct Answer
verified

What causes magnetic stripes on the seafloor, such as those shown here?

Correct Answer
verified

Correct Answer
verified

Intense geologic activity occurs at plate:

Correct Answer
verified

Convergence of two ocean plates forms an ocean-ocean:

Correct Answer
verified

On this map of the South Atlantic, which letter is on a site of seafloor spreading?

Correct Answer
verified

A divergent plate boundary is most likely associated with an) :

Correct Answer
verified

Broad symmetrical ridges that cross ocean basins are called:

Correct Answer
verified

What types of plate boundaries are shown in this figure?

Correct Answer
verified

On this map, identify which letter is over the Pacific Ocean.

Correct Answer
verified

As two oceanic plates diverge at mid-ocean ridges, melting of the rising mantle occurs due to:

Correct Answer
verified

Which of the following best represents the sequence by which a continent splits apart?

Correct Answer
verified

Exam 3: Plate Tectonics

What is associated with reversed magnetic polarity?

Correct AnswerverifiedShow Answer

Which location on this figure from the Investigation is located on the abyssal plain?

Correct AnswerverifiedShow Answer

Mantle convection involves the asthenosphere moving upward due to its lower:

Correct AnswerverifiedShow Answer

On the accompanying figure, what type of feature is located in the area of number 2?

Correct AnswerverifiedShow Answer

This figure shows plate boundaries south of Alaska. Which location is on a transform boundary?

Correct AnswerverifiedShow Answer

Why does the Tibetan Plateau, shown in this figure, have a high elevation?

Correct AnswerverifiedShow Answer

Mid-ocean ridges are higher than surrounding oceanic crust primarily because:

Correct AnswerverifiedShow Answer

What is the underlying geologic explanation for why western South America is so different from eastern South America?

Correct AnswerverifiedShow Answer

Island chains and seamounts cross parts of the ocean floor. These oceanic islands and associated seamounts are:

Correct AnswerverifiedShow Answer

What causes magnetic stripes on the seafloor, such as those shown here?

Correct AnswerverifiedShow Answer

Which of the following features is present on the seafloor off the Pacific Northwest?

Correct AnswerverifiedShow Answer

Intense geologic activity occurs at plate:

Correct AnswerverifiedShow Answer

Convergence of two ocean plates forms an ocean-ocean:

Correct AnswerverifiedShow Answer

On this map of the South Atlantic, which letter is on a site of seafloor spreading?

Correct AnswerverifiedShow Answer

A divergent plate boundary is most likely associated with an) :

Correct AnswerverifiedShow Answer

Broad symmetrical ridges that cross ocean basins are called:

Correct AnswerverifiedShow Answer

What types of plate boundaries are shown in this figure?

Correct AnswerverifiedShow Answer

On this map, identify which letter is over the Pacific Ocean.

Correct AnswerverifiedShow Answer

As two oceanic plates diverge at mid-ocean ridges, melting of the rising mantle occurs due to:

Correct AnswerverifiedShow Answer

Which of the following best represents the sequence by which a continent splits apart?

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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On the accompanying figure, what type of feature is located in the area of number 2? $On the accompanying figure, what type of feature is located in the area of number 2? A) transform fault B) mid-ocean ridge C) linear island chain D) fracture zone$

Correct Answer
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