Question 1

The magnetic field of Earth in the geologic past is ____________.

Accepted Answer

A)  unknown,but it is assumed to have been identical to today's
B)  known to have been constant through geologic time,due to remnant magnetization of iron-rich minerals in rocks
C)  known to have experienced numerous polarity reversals,due to remnant magnetization of iron-rich minerals in rocks
D)  known to have been constant through time,on the basis of theoretical calculations

Question 2

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 3

If a geologist discovered coal in a modern-day cold,snowy location,he or she could conclude that _____________.

Accepted Answer

A)  a meteorite must have struck the area
B)  the area was once covered with swamps and/or jungles
C)  the area was once covered with an ocean
D)  this discovery was anomalous

Question 4

Marine magnetic anomalies result from sea-floor 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

Marine magnetic anomaly belts run parallel to ____________.

Accepted Answer

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

Question 6

Wegener's idea of continental drift was rejected by American geologists because ____________.

Accepted Answer

A)  his English was too poor to be understood by them
B)  he could not conceive of a valid mechanism that would cause continents to shift positions
C)  he had relatively little evidence supporting the existence of a supercontinent
D)  the apparent fit of continental coastlines is blurred when the margins are defined by the edges of continental shelves rather than sea level

Question 7

The age of oceanic crust ____________ with increasing distance from a mid-ocean ridge.

Accepted Answer

A)  increases
B)  decreases

Question 8

The term and concept of sea-floor spreading (see figure below) was developed by _____________.

Accepted Answer

A)  Hess and Dietz
B)  Hess and Wegener
C)  Wegener and Dietz
D)  Wegener

Question 9

Distinctive rock sequences on South America terminate at the Atlantic Ocean but reappear on the continent of ____________.

Accepted Answer

A)  Africa
B)  Europe
C)  North America
D)  Australia

Question 10

The thickness of clay and planktonic microskeletons is greatest ____________.

Accepted Answer

A)  along mid-ocean ridges
B)  along fracture zones
C)  at the edges of ocean basins
D)  in the center of abyssal plains

Question 11

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

Exam 3: Drifting Continents and Spreading Seas

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

Correct Answer
verified

The magnetic field of Earth in the geologic past is ____________.

Correct Answer
verified

The thickness of clay and planktonic microskeletons is greatest ____________.

Correct Answer
verified

The term and concept of sea-floor spreading (see figure below) was developed by _____________.

Correct Answer
verified

Marine magnetic anomalies result from sea-floor spreading in conjunction with ____________.

Correct Answer
verified

Distinctive rock sequences on South America terminate at the Atlantic Ocean but reappear on the continent of ____________.

Correct Answer
verified

If a geologist discovered coal in a modern-day cold,snowy location,he or she could conclude that _____________.

Correct Answer
verified

The age of oceanic crust ____________ with increasing distance from a mid-ocean ridge.

Correct Answer
verified

Wegener's idea of continental drift was rejected by American geologists because ____________.

Correct Answer
verified

Marine magnetic anomaly belts run parallel to ____________.

Correct Answer
verified

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

Exam 3: Drifting Continents and Spreading Seas

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

Correct AnswerverifiedShow Answer

The magnetic field of Earth in the geologic past is ____________.

Correct AnswerverifiedShow Answer

The thickness of clay and planktonic microskeletons is greatest ____________.

Correct AnswerverifiedShow Answer

The term and concept of sea-floor spreading (see figure below) was developed by _____________.

Correct AnswerverifiedShow Answer

Marine magnetic anomalies result from sea-floor spreading in conjunction with ____________.

Correct AnswerverifiedShow Answer

Distinctive rock sequences on South America terminate at the Atlantic Ocean but reappear on the continent of ____________.

Correct AnswerverifiedShow Answer

If a geologist discovered coal in a modern-day cold,snowy location,he or she could conclude that _____________.

Correct AnswerverifiedShow Answer

The age of oceanic crust ____________ with increasing distance from a mid-ocean ridge.

Correct AnswerverifiedShow Answer

Wegener's idea of continental drift was rejected by American geologists because ____________.

Correct AnswerverifiedShow Answer

Marine magnetic anomaly belts run parallel to ____________.

Correct AnswerverifiedShow 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

Correct Answer
verified

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