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Exam 3: Drifting Continents and Spreading Seas

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Question 1

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Evidence that glaciers once covered an area might include ________.

A) till and striations
B) backwash and striations
C) till and grabens
D) backwash and grabens

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Question 2

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In the geologic past,the polarity of the Earth's magnetic field is ________.

A) unknown,but it 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

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Question 3

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Consult the figure below.Abundant swamps led to the formation of coal during the Late Paleozoic in which of the following places?

The map below depicts earthquakes,which primarily coincide with areas where ________.

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

Which of these parts of the deep-ocean floor is flat and nearly featureless?

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 ________.

Which of these statements is FALSE?

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

Earth's magnetic reversals are likely due to ________.

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

Wegener's proposal that the continents had once fit together as a single supercontinent was rejected by geologists at the time because ________.

Marine magnetic anomaly belts run parallel to ________.

Which plant genus dominated glaciated regions during the Late Paleozoic and Early Mesozoic?

Within the sea floor,the rate of geothermal heat flow is greatest ________.

Limestone reefs and salt deposits are important rocks in the reconstruction of Earth history because they ________.

Spreading rates along mid-ocean ridges have ________.

Wegener saw Pangaea as a jigsaw puzzle,where the puzzle pieces were ________.

Which mineral is integral to paleomagnestim?

Marine magnetic anomalies result from seafloor spreading in conjunction with ________.