Question 1

Crevasses (deep fractures or cracks) form because ________.

Accepted Answer

A)  not all of the ice in a glacier moves downhill at the same rate in the glacier
B)  as the glacier moves over irregular topography the bottom of the glacier (known as the zone of fracture) cracks and the cracks propagate upward to the surface of the glacier
C)  as the glacier moves over irregular topography,the brittle upper layer or zone of fracture is subject to tension and cracks above the ductile layer
D)  as the glacier moves over irregular topography,cracks can form anywhere in the glacier but they are called "crevasses" only if they are near the surface
E)  there is not always the same amount of ice available in all areas so cracks form when the ice tries to move and fill in empty parts of the glacierF) C) and D)
G) B) and C)

Question 2

Arêtes,horns,and U-shaped valleys are erosional features carved from bedrock by glaciers.

Accepted Answer

A) True 
 B)False

Question 3

In a dry climate,weathering is significantly less than in a humid climate because ________.

Accepted Answer

A)  wind is not a significant weathering agent
B)  there is a shortage of moisture and organic acids
C)  rivers are ephemeral and do not cause weathering in the desert
D)  sand covers much of the rock surface and protects them from weathering in a desertE) A) and B)
F) A) and C)

Question 4

Most of an iceberg is under water because ________.

Accepted Answer

A)  ice is more dense than seawater
B)  seawater is more dense than ice
C)  the mass of an iceberg is concentrated in the zone of wastage
D)  the mass of an iceberg is concentrated in the zone of accumulationE) None of the above
F) C) and D)

Question 5

Which letter,T thru Z,corresponds to the object in the photo labeled "A"?

Accepted Answer

The answer of Which letter,T thru Z,corresponds to the object...

Question 6

Bajadas develop from coalescence of alluvial fans along fronts of mountain ranges in arid lands.

Accepted Answer

A) True 
 B)False

Question 7

loess alluvial fan playa inselberg

Accepted Answer

The answer of loess alluvial fan playa inselberg...

Question 8

When a glacier is retreating,the upstream ice is still moving forward toward the downstream terminus of the glacier.

Accepted Answer

A) True 
 B)False

Question 9

Running water is an important erosional agent in many arid lands despite infrequent rainfalls.

Accepted Answer

A) True 
 B)False

Question 10

Our detailed knowledge of the glacial cycles and their duration is based primarily on ________.

Accepted Answer

A)  ice cores
B)  seafloor sediments
C)  land sediments
D)  climate recordsE) None of the above
F) All of the above

Question 11

A ________ forms when a block of ice is buried in drift and subsequently melts,creating a pit.

Accepted Answer

A)  tarn
B)  paternoster
C)  kame
D)  kettleE) C) and D)
F) A) and B)

Question 12

Bowl-shaped depressions in bedrock at upstream ends of alpine glacial valleys are called ________.

Accepted Answer

The answer of Bowl-shaped depressions in bedrock at upstream ends...

Question 13

At the base of a glacier,the ice moves by ________.

Accepted Answer

A)  fracturing
B)  fracturing and sliding
C)  sliding and ductile flow
D)  ductile flow and fracturingE) All of the above
F) A) and D)

Question 14

Why is wind less effective than moving water at picking up and moving materials?

Accepted Answer

A)  Air is less dense than water
B)  Air moves slower than water
C)  Air moves faster than water
D)  Air does not move very farE) None of the above
F) C) and D)

Question 15

What of the following is considered to be the most likely cause of the Quaternary Ice ages?

Accepted Answer

A)  human activity releasing "greenhouse" gases
B)  plate tectonics moving continents to polar regions
C)  variations in the earth's orbit
D)  variations in the Sun's intensityE) None of the above
F) A) and B)

Question 16

How is sea ice different from glacial ice?

Accepted Answer

A)  Sea ice is thicker than glacial ice,and sea ice floats while glacial ice does not float.
B)  Sea ice is thicker than glacial ice,and both sea ice and glacial ice can float.
C)  Sea ice is thinner than glacial ice,and both sea ice and glacial ice can float.
D)  Sea ice is thinner than glacial ice,and sea ice floats while glacial ice does not float.E) C) and D)
F) A) and B)

Question 17

If all of the ice now stored in Antarctica's glaciers melted,what would happen?

Accepted Answer

A)  Sea water would become fresh enough to drink because glaciers are made of fresh water.
B)  Sea level would rise flooding many coastal cities.
C)  Because glacial melt water is less dense than sea water,the glacial melt will float on top of the ocean and not affect the land areas.
D)  Ice bergs would float to the equatorial regions of the earth where they would lower the temperature and cause the climate to become cooler.E) A) and D)
F) All of the above

Question 18

calving zone of accumulation melting zone of wastage

Accepted Answer

zone of ac...

Question 19

Glaciation has only been recorded for the Quaternary period of the earth's history demonstrating that the cause of the Ice Ages is the earth's orbit moving farther from the Sun.

Accepted Answer

A) True 
 B)False

Question 20

The loess deposited in many parts of the Midwest ________.

Accepted Answer

A)  was once glacial outwash deposits
B)  is in the form of transverse dunes
C)  is uniformly thick
D)  had its source in desert regionsE) B) and C)
F) A) and B)

Exam 6: Glaciers, deserts, and Wind

At the base of a glacier,the ice moves by ________.

Correct AnswerverifiedShow Answer

A ________ forms when a block of ice is buried in drift and subsequently melts,creating a pit.

Correct AnswerverifiedShow Answer

Why is wind less effective than moving water at picking up and moving materials?

Correct AnswerverifiedShow Answer

loess alluvial fan playa inselberg

Correct AnswerverifiedShow Answer

Running water is an important erosional agent in many arid lands despite infrequent rainfalls.

Correct AnswerverifiedShow Answer

The loess deposited in many parts of the Midwest ________.

Correct AnswerverifiedShow Answer

Most of an iceberg is under water because ________.

Correct AnswerverifiedShow Answer

Glaciation has only been recorded for the Quaternary period of the earth's history demonstrating that the cause of the Ice Ages is the earth's orbit moving farther from the Sun.

Correct AnswerverifiedShow Answer

Arêtes,horns,and U-shaped valleys are erosional features carved from bedrock by glaciers.

Correct AnswerverifiedShow Answer

Crevasses (deep fractures or cracks) form because ________.

Correct AnswerverifiedShow Answer

Bowl-shaped depressions in bedrock at upstream ends of alpine glacial valleys are called ________.

Correct AnswerverifiedShow Answer

If all of the ice now stored in Antarctica's glaciers melted,what would happen?

Correct AnswerverifiedShow Answer

In a dry climate,weathering is significantly less than in a humid climate because ________.

Correct AnswerverifiedShow Answer

When a glacier is retreating,the upstream ice is still moving forward toward the downstream terminus of the glacier.

Correct AnswerverifiedShow Answer

How is sea ice different from glacial ice?

Correct AnswerverifiedShow Answer

calving zone of accumulation melting zone of wastage

Correct Answerverifiedzone of ac...View AnswerShow Answer

What of the following is considered to be the most likely cause of the Quaternary Ice ages?

Correct AnswerverifiedShow Answer

Bajadas develop from coalescence of alluvial fans along fronts of mountain ranges in arid lands.

Correct AnswerverifiedShow Answer

Which letter,T thru Z,corresponds to the object in the photo labeled "A"?

Correct AnswerverifiedShow Answer

Our detailed knowledge of the glacial cycles and their duration is based primarily on ________.

Correct AnswerverifiedShow Answer

Correct Answer
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zone of ac...
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