Question 1

Plate Tectonic boundaries were first identified by ________.

Accepted Answer

A)  mapping the mountain chains
B)  mapping subduction zone
C)  mapping earthquakes and volcanoes
D)  mapping continental marginsE) None of the above
F) A) and B)

Question 2

oceanic ridge seafloor spreading arc volcanoes divergent

Accepted Answer

The answer of oceanic ridge seafloor spreading arc volcanoes divergent...

Question 3

Which of the following major discoveries was not made near or after World War II?

Accepted Answer

A)  the extensive ranges of mountain chains on the sea floor
B)  deep focus earthquakes that occur in some regions of the earth
C)  rift valleys in Africa
D)  the absence of rocks older than 200 million years on the sea floorE) None of the above
F) A) and D)

Question 4

Explain why the Mesosaurus was a good example to support Wegener's ideas.

Accepted Answer

Mesosaurus fossils were only found in a ...

Question 5

A map of the ages of the sea floor shows ________.

Accepted Answer

A)  the direction of the plate motions
B)  the location of modern plate boundaries
C)  how much material was produced at the ridges during a given period of time
D)  how fast the plates are movingE) C) and D)
F) All of the above

Question 6

A transform boundary is characterized by ________.

Accepted Answer

A)  a deep,vertical fault along which two plates slide past one another in opposite directions
B)  stratovolcanoes on the edge of a plate and shield volcanoes on the adjacent plate
C)  two converging oceanic plates meeting head-on and piling up into a mid-ocean ridge
D)  a divergent boundary where the continental plate changes to an oceanic plateE) C) and D)
F) A) and B)

Question 7

A major problem with Wegener's Continental Drift Hypothesis was that he could not find rocks or other geologic features that would have been continuous from one continent to the next if the continents had been together.

Accepted Answer

A) True 
 B)False

Question 8

What was the main view how the world worked geologically prior to the 1960s?

Accepted Answer

A)  It was generally believed that the earth was flat.
B)  It was generally believed that mountains were produced by vertical forces.
C)  It was generally believed that continents and oceans moved.
D)  It was generally believed that oceans formed as a result of meteorite impacts.E) B) and C)
F) All of the above

Question 9

Oceanic crust has a mafic composition and therefore is denser than continental crust.

Accepted Answer

A) True 
 B)False

Question 10

Iceland is a good example of an island arc,formed from an oceanic-oceanic plate collision.

Accepted Answer

A) True 
 B)False

Question 11

Earth's radius and surface area are slowly increasing to accommodate the new oceanic crust being formed at mid-ocean ridges.

Accepted Answer

A) True 
 B)False

Question 12

Wegener thought that ________.

Accepted Answer

A)  there were once two big continents that were separated later by the Atlantic Ocean
B)  there was once one big continent that was later separated by the Atlantic Ocean
C)  there was once one big continent that later broke into several pieces
D)  there were once several continents that recombined to form the continents we have todayE) All of the above
F) A) and C)

Question 13

Volcanoes form above subduction zones because ________.

Accepted Answer

A)  the subducting lithosphere melts as it descends and the magma rises to form volcanoes
B)  the lithosphere thickens above the subducting lithosphere and causes volcanoes to form
C)  the asthenosphere is displaced by the subducting lithosphere and rises to the surface to form volcanoes
D)  water is squeezed out of the subducting slab and the water triggers melting of the overlying asthenosphereE) C) and D)
F) None of the above

Question 14

Oceanic island arcs are similar to continental volcanic arcs in that ________.

Accepted Answer

A)  oceanic island arcs form on continents when oceanic lithosphere is subducted
B)  oceanic islands arcs form by the same mechanism as continental arcs
C)  continental arcs make islands that are arc-shaped
D)  major continental mountain ranges formed from island arcsE) A) and C)
F) C) and D)

Question 15

Apparent changes in the position of the magnetic pole measured in rocks in Europe is attributed to ________.

Accepted Answer

A)  changes in the solar flux
B)  movement of lithospheric plates
C)  polar wandering
D)  random magnetic reversalsE) C) and D)
F) B) and D)

Question 16

New York and London are on two separate plates so the distance between the cities is ________.

Accepted Answer

A)  stationary
B)  increasing
C)  decreasing
D)  always changing directionE) C) and D)
F) All of the above

Question 17

Briefly explain how magnetic patterns on the seafloor support Plate Tectonic theory.

Accepted Answer

the magnetic patterns of highs and lows ...

Question 18

All of the earth's ocean basins are ________.

Accepted Answer

A)  less than 2 million years old
B)  less than 20 million years old
C)  less than 200 million years old
D)  less than 2000 million years oldE) B) and C)
F) B) and D)

Question 19

Alfred Wegener developed the theory of Plate Tectonics.

Accepted Answer

A) True 
 B)False

Question 20

Fracture zone associated with transform boundaries are ________.

Accepted Answer

A)  active faults
B)  inactive faults
C)  fractures in the seafloor that did not become faults
D)  topographic markers of where Pangaea originally broke apartE) None of the above
F) B) and D)

Exam 7: Plate Tectonics: a Scientific Revolution Unfolds

A map of the ages of the sea floor shows ________.

Correct AnswerverifiedShow Answer

Fracture zone associated with transform boundaries are ________.

Correct AnswerverifiedShow Answer

Earth's radius and surface area are slowly increasing to accommodate the new oceanic crust being formed at mid-ocean ridges.

Correct AnswerverifiedShow Answer

Oceanic crust has a mafic composition and therefore is denser than continental crust.

Correct AnswerverifiedShow Answer

What was the main view how the world worked geologically prior to the 1960s?

Correct AnswerverifiedShow Answer

Apparent changes in the position of the magnetic pole measured in rocks in Europe is attributed to ________.

Correct AnswerverifiedShow Answer

All of the earth's ocean basins are ________.

Correct AnswerverifiedShow Answer

Iceland is a good example of an island arc,formed from an oceanic-oceanic plate collision.

Correct AnswerverifiedShow Answer

Wegener thought that ________.

Correct AnswerverifiedShow Answer

Oceanic island arcs are similar to continental volcanic arcs in that ________.

Correct AnswerverifiedShow Answer

Explain why the Mesosaurus was a good example to support Wegener's ideas.

Correct AnswerverifiedMesosaurus fossils were only found in a ...View AnswerShow Answer

Volcanoes form above subduction zones because ________.

Correct AnswerverifiedShow Answer

Alfred Wegener developed the theory of Plate Tectonics.

Correct AnswerverifiedShow Answer

A major problem with Wegener's Continental Drift Hypothesis was that he could not find rocks or other geologic features that would have been continuous from one continent to the next if the continents had been together.

Correct AnswerverifiedShow Answer

Briefly explain how magnetic patterns on the seafloor support Plate Tectonic theory.

Correct Answerverifiedthe magnetic patterns of highs and lows ...View AnswerShow Answer

New York and London are on two separate plates so the distance between the cities is ________.

Correct AnswerverifiedShow Answer

Plate Tectonic boundaries were first identified by ________.

Correct AnswerverifiedShow Answer

oceanic ridge seafloor spreading arc volcanoes divergent

Correct AnswerverifiedShow Answer

A transform boundary is characterized by ________.

Correct AnswerverifiedShow Answer

Which of the following major discoveries was not made near or after World War II?

Correct AnswerverifiedShow Answer

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Mesosaurus fossils were only found in a ...
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the magnetic patterns of highs and lows ...
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