Question 1

As continents drift, they plow through the thinner ocean lithosphere like big rocky "ice breakers" and push it out of their way.

Accepted Answer

A) True 
 B)False

Question 2

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

Accepted Answer

A) True 
 B)False

Question 3

During various times in the geologic past, the polarity of Earth's magnetic field has been reversed.

Accepted Answer

A) True 
 B)False

Question 4

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

Accepted Answer

A)  Geometric fit between South America and Africa
B)  Islands of Proterozoic rocks along the Mid-Atlantic Ridge
C)  Late Paleozoic glacial features
D)  The Glossopteris floraE) A) and B)
F) B) and C)

Question 5

What are three ways of measuring plate tectonic rates of movement?

Accepted Answer

Measuring magnetic stripes on ...

Question 6

In general, rocks of the continental crust are less dense than rocks of the oceanic crust.

Accepted Answer

A) True 
 B)False

Question 7

The longest topographic feature on Earth, at > 70,000 kilometres, is the mid-ocean ridge system.

Accepted Answer

A) True 
 B)False

Question 8

Provide an example of Wegener's conjectures about continental drift for which there is no evidence.

Accepted Answer

continents plowed th...

Question 9

A transform plate boundary is characterized by ________.

Accepted Answer

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

Question 10

By the Middle Jurassic, about 150 million years ago, Pangaea had split into Laurasia and Gondwanaland by the rifting that was opening the North Atlantic.

Accepted Answer

A) True 
 B)False

Question 11

From the list below, which contribution did J.Tuzo Wilson make to Plate Tectonic theory?

Accepted Answer

A)  the existence of mid-ocean ridges and the correlation of magnetic stripes to seafloor spreading
B)  the existence of fracture zones in the ocean crust, rigid lithospheric plates, and intraplate hot spots
C)  that the largest earthquake zones were over dipping oceanic plates
D)  the rifting of continents like Pangaea and GondwanalandE) None of the above
F) C) and D)

Question 12

Pangaea was ________.

Accepted Answer

A)  a large, ocean basin that opened in the Triassic and closed in the Paleocene
B)  a large, Precambrian shield area in Africa and South America that broke apart late in the Proterozoic Eon
C)  a huge mountain range formed when Africa pushed northward into Europe in Eocene time
D)  a super continent that formed in the late Paleozoic and broke apart in Triassic timeE) C) and D)
F) None of the above

Question 13

During the first quarter of the twentieth century, ________ was the most vigorous proponent of continental drift.

Accepted Answer

The answer of During the first quarter of the twentieth...

Question 14

In the early part of the 20th century, ________ argued forcefully for continental drift.

Accepted Answer

A)  Karl Wagner
B)  Peter Rommel
C)  Alfred Wegener
D)  Bill KohlE) C) and D)
F) A) and D)

Question 15

Where lithosphere is sinking into the mantle, it is a ________ plate boundary.

Accepted Answer

A)  convergent
B)  transform
C)  divergent
D)  strike-slipE) A) and B)
F) None of the above

Question 16

Which of the following energy sources is thought to directly drive the lateral motions of Earth's lithospheric plates?

Accepted Answer

A)  tidal gravitational attractive forces of the Sun and Moon
B)  electric and magnetic fields generated in and radiating from the inner core
C)  export of heat from deep in the mantle to the top of the asthenosphere and descending cold material in a solid state convective flow
D)  rotational spinning of the Earth, with the plates dragging behindE) B) and C)
F) A) and C)

Question 17

________ to the south and ________ to the north were the two remaining halves of the Pangaea supercontinent once the Atlantic started to rift open.

Accepted Answer

Gondwanala...

Question 18

Following technologic advances in ocean mapping that came from the Cold War in the 1950s and 1960s the new data from the ocean basins led ________ to propose the first model for seafloor spreading.

Accepted Answer

A)  Sir Edward Bullard
B)  Harry Hess
C)  Keith Runcorn
D)  Alfred WegenerE) A) and B)
F) A) and C)

Question 19

Early results of the Deep Sea Drilling Project clearly justified the conclusion that ________.

Accepted Answer

A)  the oceans have not always contained most of Earth's water
B)  the ocean basins are geologically young (<Cretaceous) and become younger towards the ridge
C)  Proterozoic rocks are found only as seamounts in the deepest parts of the ocean basins
D)  the youngest sediments were deposited directly on the oldest seafloor basaltsE) None of the above
F) A) and D)

Question 20

Of the approximately 40 "fixed" mantle hot spots, 12 of them are actually located on or near mid-ocean ridges and several of these generate symmetric lines of seamounts on both diverging plates.

Accepted Answer

A) True 
 B)False

Exam 12: Plate Tectonics: The Framework for Modern Geology

During the first quarter of the twentieth century, ________ was the most vigorous proponent of continental drift.

Correct AnswerverifiedShow Answer

Which of the following energy sources is thought to directly drive the lateral motions of Earth's lithospheric plates?

Correct AnswerverifiedShow Answer

From the list below, which contribution did J.Tuzo Wilson make to Plate Tectonic theory?

Correct AnswerverifiedShow Answer

Early results of the Deep Sea Drilling Project clearly justified the conclusion that ________.

Correct AnswerverifiedShow Answer

Provide an example of Wegener's conjectures about continental drift for which there is no evidence.

Correct Answerverifiedcontinents plowed th...View AnswerShow Answer

As continents drift, they plow through the thinner ocean lithosphere like big rocky "ice breakers" and push it out of their way.

Correct AnswerverifiedShow Answer

What are three ways of measuring plate tectonic rates of movement?

Correct AnswerverifiedMeasuring magnetic stripes on ...View AnswerShow Answer

In the early part of the 20th century, ________ argued forcefully for continental drift.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

By the Middle Jurassic, about 150 million years ago, Pangaea had split into Laurasia and Gondwanaland by the rifting that was opening the North Atlantic.

Correct AnswerverifiedShow Answer

________ to the south and ________ to the north were the two remaining halves of the Pangaea supercontinent once the Atlantic started to rift open.

Correct AnswerverifiedGondwanala...View AnswerShow Answer

During various times in the geologic past, the polarity of Earth's magnetic field has been reversed.

Correct AnswerverifiedShow Answer

The longest topographic feature on Earth, at > 70,000 kilometres, is the mid-ocean ridge system.

Correct AnswerverifiedShow Answer

In general, rocks of the continental crust are less dense than rocks of the oceanic crust.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Where lithosphere is sinking into the mantle, it is a ________ plate boundary.

Correct AnswerverifiedShow Answer

Pangaea was ________.

Correct AnswerverifiedShow Answer

A transform plate boundary is characterized by ________.

Correct AnswerverifiedShow Answer

Of the approximately 40 "fixed" mantle hot spots, 12 of them are actually located on or near mid-ocean ridges and several of these generate symmetric lines of seamounts on both diverging plates.

Correct AnswerverifiedShow Answer

Following technologic advances in ocean mapping that came from the Cold War in the 1950s and 1960s the new data from the ocean basins led ________ to propose the first model for seafloor spreading.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
continents plowed th...
View Answer

Correct Answer
verified

Correct Answer
verified
Measuring magnetic stripes on ...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

to the south and to the north were the two remaining halves of the Pangaea supercontinent once the Atlantic started to rift open.

Correct Answer
verified
Gondwanala...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified