Question 1

The polarity of the Earth's magnetic field in the geologic past is

Accepted Answer

A)   unknown,but is assumed to have been identical to today's.
B)   known to have stayed constant through geologic time,as shown by remnant magnetization of iron-rich minerals in rocks.
C)   known to have experienced numerous reversals,as shown by remnant magnetization of iron-rich minerals in rocks.
D)   known to have stayed constant through time,based on theoretical calculations.

Question 2

Wegener's evidence for a united Pangaea comes from the fossil record of which type of organisms?

Accepted Answer

A)   plant pollen
B)   plankton
C)   marine animals
D)   land animals

Question 3

The apparent tendency of the north (or south) magnetic pole to vary in position over time is termed

Accepted Answer

A)   dipole.
B)   magnetic declination.
C)   magnetic inclination.
D)   polar wander. D

Question 4

Marine magnetic anomalies result from seafloor spreading in conjunction with

Accepted Answer

A)   global warming.
B)   magnetic storms on the surface of the Sun.
C)   magnetic polarity reversals.
D)   apparent wander of the magnetic poles.

Question 5

The discovery that each continent had different and separate apparent polar-wander paths,such as those in the figure below,proved that

Accepted Answer

A)   the continents move.
B)   the poles move.
C)   both the poles and continents move,but only one at a time.
D)   both the poles and continents move,and do so together. A

Question 6

What evidence did Alfred Wegener use to support his continental-drift hypothesis? Was the evidence compelling? Why or why not?

Accepted Answer

Wegener's evidence for his continental-d...

Question 7

If you were using both a compass and a map marked with latitude and longitude to navigate,you might note the angle difference between your compass and what is marked on the map,called

Accepted Answer

A)   magnetic inclination.
B)   magnetic declination.
C)   magnetic dipole.
D)   magnetic reversal.

Question 8

Regions of the sea floor with positive magnetic anomalies were formed during times when the Earth's magnetic field

Accepted Answer

A)   was exceptionally strong.
B)   was exceptionally weak.
C)   had normal polarity.
D)   had reversed polarity.

Question 9

Marine magnetic anomaly belts run parallel to

Accepted Answer

A)   mid-ocean ridges.
B)   fracture zones.
C)   continental coastlines.
D)   continental shelves.

Question 10

Regions of the sea floor with negative magnetic anomalies were formed during times when the Earth's magnetic field

Accepted Answer

A)   was exceptionally strong.
B)   was exceptionally weak.
C)   had normal polarity.
D)   had reversed polarity.

Question 11

According to the figure below,marine magnetic anomalies lay roughly ________ to mid-ocean ridges.

Accepted Answer

A)   perpendicular
B)   parallel
C)   adjacent
D)   at an obtuse angle

Question 12

The majority of new oceanic crust is created

Accepted Answer

A)   at subduction zones.
B)   along fracture zones.
C)   at mid-ocean ridges.
D)   by ocean island volcanism.

Question 13

The broad flat regions that occupy most of the ocean floor are

Accepted Answer

A)   abyssal plains.
B)   continental rises.
C)   fracture zones.
D)   seamounts. A

Question 14

Beneath a blanket of sediments,oceanic crust is primarily composed of

Accepted Answer

A)   granite.
B)   basalt.
C)   limestone.
D)   coal.

Question 15

As shown below,Wegener proposed continental drift after he observed evidence from fossils,glacial deposits,and the fit of the continents that suggested all of the continents were once

Accepted Answer

A)   aligned north to south along the prime meridian.
B)   aligned east to west along the equator.
C)   combined to form a supercontinent he termed Rodinia.
D)   combined to form a supercontinent he termed Pangaea.

Question 16

Describe patterns of sedimentation on the seafloor.What can be learned from this?

Accepted Answer

Seafloor sediments are too thin to have ...

Question 17

Which of the following best describes the distribution of earthquakes?

Accepted Answer

A)   They tend to occur randomly on the continents.
B)   They tend to occur randomly in the ocean basins.
C)   They tend to occur randomly both on the continents and in ocean basins.
D)   They occur in distinct zones.

Question 18

What is a magnetic anomaly? What is the difference between a positive and negative anomaly?

Accepted Answer

The term magnetic anomaly refers to the ...

Question 19

All deep-sea trenches border

Accepted Answer

A)   fracture zones.
B)   mid-ocean ridges.
C)   volcanic arcs.
D)   seamounts.

Question 20

Sketch a simplified cross-section of the ocean floor for both the Pacific and Atlantic Oceans.Be sure to label the mid-ocean ridge,abyssal plains,and deep-sea trenches.How are the Atlantic and Pacific Oceans different with regard to seafloor spreading? What tectonic process dominates in each ocean basin?

Accepted Answer

The Mid-Atlantic Ridge runs ...

Exam 3: Drifting Continents and Spreading Seas

The polarity of the Earth's magnetic field in the geologic past is

Correct Answer
verified

Wegener's evidence for a united Pangaea comes from the fossil record of which type of organisms?

Correct Answer
verified

The apparent tendency of the north (or south) magnetic pole to vary in position over time is termed

Correct Answer
verified
D

Marine magnetic anomalies result from seafloor spreading in conjunction with

Correct Answer
verified

The discovery that each continent had different and separate apparent polar-wander paths,such as those in the figure below,proved that

Correct Answer
verified
A

What evidence did Alfred Wegener use to support his continental-drift hypothesis? Was the evidence compelling? Why or why not?

Correct Answer
verified
Wegener's evidence for his continental-d...
View Answer

If you were using both a compass and a map marked with latitude and longitude to navigate,you might note the angle difference between your compass and what is marked on the map,called

Correct Answer
verified

Regions of the sea floor with positive magnetic anomalies were formed during times when the Earth's magnetic field

Correct Answer
verified

Marine magnetic anomaly belts run parallel to

Correct Answer
verified

Regions of the sea floor with negative magnetic anomalies were formed during times when the Earth's magnetic field

Correct Answer
verified

According to the figure below,marine magnetic anomalies lay roughly ________ to mid-ocean ridges.

Correct Answer
verified

The majority of new oceanic crust is created

Correct Answer
verified

The broad flat regions that occupy most of the ocean floor are

Correct Answer
verified
A

Beneath a blanket of sediments,oceanic crust is primarily composed of

Correct Answer
verified

As shown below,Wegener proposed continental drift after he observed evidence from fossils,glacial deposits,and the fit of the continents that suggested all of the continents were once

Correct Answer
verified

Describe patterns of sedimentation on the seafloor.What can be learned from this?

Correct Answer
verified
Seafloor sediments are too thin to have ...
View Answer

Which of the following best describes the distribution of earthquakes?

Correct Answer
verified

What is a magnetic anomaly? What is the difference between a positive and negative anomaly?

Correct Answer
verified
The term magnetic anomaly refers to the ...
View Answer

All deep-sea trenches border

Correct Answer
verified

Correct Answer
verified
The Mid-Atlantic Ridge runs ...
View Answer

Exam 3: Drifting Continents and Spreading Seas

The polarity of the Earth's magnetic field in the geologic past is

Correct AnswerverifiedShow Answer

Wegener's evidence for a united Pangaea comes from the fossil record of which type of organisms?

Correct AnswerverifiedShow Answer

The apparent tendency of the north (or south) magnetic pole to vary in position over time is termed

Correct AnswerverifiedD

Marine magnetic anomalies result from seafloor spreading in conjunction with

Correct AnswerverifiedShow Answer

The discovery that each continent had different and separate apparent polar-wander paths,such as those in the figure below,proved that

Correct AnswerverifiedA

What evidence did Alfred Wegener use to support his continental-drift hypothesis? Was the evidence compelling? Why or why not?

Correct AnswerverifiedWegener's evidence for his continental-d...View AnswerShow Answer

If you were using both a compass and a map marked with latitude and longitude to navigate,you might note the angle difference between your compass and what is marked on the map,called

Correct AnswerverifiedShow Answer

Regions of the sea floor with positive magnetic anomalies were formed during times when the Earth's magnetic field

Correct AnswerverifiedShow Answer

Marine magnetic anomaly belts run parallel to

Correct AnswerverifiedShow Answer

Regions of the sea floor with negative magnetic anomalies were formed during times when the Earth's magnetic field

Correct AnswerverifiedShow Answer

According to the figure below,marine magnetic anomalies lay roughly ________ to mid-ocean ridges.

Correct AnswerverifiedShow Answer

The majority of new oceanic crust is created

Correct AnswerverifiedShow Answer

The broad flat regions that occupy most of the ocean floor are

Correct AnswerverifiedA

Beneath a blanket of sediments,oceanic crust is primarily composed of

Correct AnswerverifiedShow Answer

As shown below,Wegener proposed continental drift after he observed evidence from fossils,glacial deposits,and the fit of the continents that suggested all of the continents were once

Correct AnswerverifiedShow Answer

Describe patterns of sedimentation on the seafloor.What can be learned from this?

Correct AnswerverifiedSeafloor sediments are too thin to have ...View AnswerShow Answer

Which of the following best describes the distribution of earthquakes?

Correct AnswerverifiedShow Answer

What is a magnetic anomaly? What is the difference between a positive and negative anomaly?

Correct AnswerverifiedThe term magnetic anomaly refers to the ...View AnswerShow Answer

All deep-sea trenches border

Correct AnswerverifiedShow Answer

Correct Answerverified The Mid-Atlantic Ridge runs ...View AnswerShow Answer

Correct Answer
verified

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D

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A

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Wegener's evidence for his continental-d...
View Answer

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A

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verified
Seafloor sediments are too thin to have ...
View Answer

Correct Answer
verified

Correct Answer
verified
The term magnetic anomaly refers to the ...
View Answer

Correct Answer
verified

Correct Answer
verified
The Mid-Atlantic Ridge runs ...
View Answer