Question 1

Which of the following plates is getting significantly smaller?

Accepted Answer

A)  Pacific
B)  North America
C)  Africa
D)  Eurasia

Question 2

________ was (were) never proposed as evidence supporting the existence of Pangaea.

Accepted Answer

A)  Geometrical fit between South America and Africa
B)  Islands of Precambrian rocks along the Mid-Atlantic Ridge
C)  Late Paleozoic glacial features
D)  Similar fossils on different continents

Question 3

The greater the density,the steeper the angle of descent for the subducting slab.

Accepted Answer

A) True 
 B)False

Question 4

Which ocean formed as a direct result of the breakup of Pangaea?

Accepted Answer

A)  Pacific
B)  Arctic
C)  Mediterranean
D)  Atlantic

Question 5

The San Andreas fault zone in California is an example of ________.

Accepted Answer

A)  a transform plate boundary
B)  a continental rift
C)  a divergent plate boundary
D)  an ocean-continent collision

Question 6

Briefly explain how deep trenches form.

Accepted Answer

Bending of the downgoing (subducting)oce...

Question 7

Hawaii is the oldest island of the Hawaiian Island chain.

Accepted Answer

A) True 
 B)False

Question 8

What is a typical rate for seafloor spreading?

Accepted Answer

A)  2 cm/s
B)  2 cm/hr
C)  2 cm/day
D)  2 cm/yr

Question 9

All of the following are evidence supporting the theory of plate tectonics except for ________.

Accepted Answer

A)  changes in the Moon's orbit due to shifting plates
B)  ocean floor drilling
C)  hot spots
D)  paleomagnetism

Question 10

Most of the molten material that is generated above the subducting slab never reaches the surface to form a volcano.

Accepted Answer

A) True 
 B)False

Question 11

Mount St.Helens and the other Cascade volcanoes are ________.

Accepted Answer

A)  young,active stratovolcanoes built on a continental margin above a sinking slab of oceanic lithosphere
B)  a row of young,active,shield volcanoes built as western North America moved over a hot spot deep in the mantle
C)  old,deeply eroded stratovolcanoes built before the Pacific Ocean existed
D)  old,deeply eroded,basaltic shield volcanoes built when western North America was over the present-day site of the Hawaiian hot spot

Question 12

Identify the letter in the figure below that corresponds to a fracture zone:

Accepted Answer

The answer of Identify the letter in the figure below...

Question 13

The major driving force of Plate Tectonics is ________.

Accepted Answer

A)  subduction of cold,dense lithosphere
B)  subduction of hot lithosphere
C)  decompression melting and the rise of magmas at spreading ridges
D)  heating of magma near the surface of the lithosphere

Question 14

The change from thinking the continents are stationary to understanding that the outer layer of the earth moves slowly nearly all of the time occurred primarily because ________.

Accepted Answer

A)  we got space travel and could see the motions
B)  we improved our surveying instruments significantly
C)  we had two world wars and learned a lot from them about the oceans that explained how continents moved
D)  we began to make global observations that required recognition that the continents and oceans had not always been in their current positions

Question 15

Which of the following is not evidence collected by the Glomar Challenger in support of the Plate Tectonic model?

Accepted Answer

A)  Fossils increase in age with increasing distance from the ridges.
B)  Continental crust is typically several hundred million years old or older.
C)  Oceanic crust is less than 180 million years old.
D)  Sediments get thicker with increasing distance from the ridges.

Question 16

When two continents converge,________.

Accepted Answer

A)  the heavier continent is subducted
B)  the lighter continent is subducted
C)  the sediments trapped between them are pushed up and deformed to make a mountain range
D)  a volcanic arc forms on the upper plate

Question 17

The main objection to Wegner's theory of Continental Drift was ________.

Accepted Answer

A)  the ocean basins show no evidence of opening and closing.
B)  clear evidence of land bridges,like the one connecting Alaska and eastern Russia,clearly exist and explain most of Wegner's observations without Continental Drift.
C)  Wegner's gravitational mechanism for the movement of continents would also stop the Earth's rotation which has not happened.
D)  the tracks of the moving continents could not be identified on the ocean floor.

Question 18

Explain why Wegner's use of shorelines to match continents in his reconstruction of Pangaea was criticized by other geoscientists and how that issue was subsequently resolved in Plate Tectonic Theory.

Accepted Answer

Wegner used the shorelines to match cont...

Question 19

Oceanic Ridges are wider than most mountain belts.

Accepted Answer

A) True 
 B)False

Question 20

The oldest rocks of the oceanic crust are found in deep ocean trenches far away from active,mid-ocean ridges.

Accepted Answer

A) True 
 B)False

Exam 7: Plate Tectonics: a Scientific Revolution Unfolds

Which of the following plates is getting significantly smaller?

Correct AnswerverifiedShow Answer

Most of the molten material that is generated above the subducting slab never reaches the surface to form a volcano.

Correct AnswerverifiedShow Answer

All of the following are evidence supporting the theory of plate tectonics except for ________.

Correct AnswerverifiedShow Answer

Hawaii is the oldest island of the Hawaiian Island chain.

Correct AnswerverifiedShow Answer

Mount St.Helens and the other Cascade volcanoes are ________.

Correct AnswerverifiedShow Answer

Which ocean formed as a direct result of the breakup of Pangaea?

Correct AnswerverifiedShow Answer

Explain why Wegner's use of shorelines to match continents in his reconstruction of Pangaea was criticized by other geoscientists and how that issue was subsequently resolved in Plate Tectonic Theory.

Correct AnswerverifiedWegner used the shorelines to match cont...View AnswerShow Answer

The oldest rocks of the oceanic crust are found in deep ocean trenches far away from active,mid-ocean ridges.

Correct AnswerverifiedShow Answer

When two continents converge,________.

Correct AnswerverifiedShow Answer

Identify the letter in the figure below that corresponds to a fracture zone:

Correct AnswerverifiedShow Answer

Oceanic Ridges are wider than most mountain belts.

Correct AnswerverifiedShow Answer

What is a typical rate for seafloor spreading?

Correct AnswerverifiedShow Answer

The San Andreas fault zone in California is an example of ________.

Correct AnswerverifiedShow Answer

The main objection to Wegner's theory of Continental Drift was ________.

Correct AnswerverifiedShow Answer

The change from thinking the continents are stationary to understanding that the outer layer of the earth moves slowly nearly all of the time occurred primarily because ________.

Correct AnswerverifiedShow Answer

________ was (were) never proposed as evidence supporting the existence of Pangaea.

Correct AnswerverifiedShow Answer

Which of the following is not evidence collected by the Glomar Challenger in support of the Plate Tectonic model?

Correct AnswerverifiedShow Answer

Briefly explain how deep trenches form.

Correct AnswerverifiedBending of the downgoing (subducting)oce...View AnswerShow Answer

The major driving force of Plate Tectonics is ________.

Correct AnswerverifiedShow Answer

The greater the density,the steeper the angle of descent for the subducting slab.

Correct AnswerverifiedShow Answer

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Wegner used the shorelines to match cont...
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Identify the letter in the figure below that corresponds to a fracture zone: $Identify the letter in the figure below that corresponds to a fracture zone:$

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Bending of the downgoing (subducting)oce...
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Correct Answer
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