Question 1

Barchans form in areas with strong unidirectional winds and a large sand supply.

Accepted Answer

A) True 
 B)False

Question 2

The direction in which migrating dunes are moving can be determined by observing the cross-bedding of a dune, formed by the movement of sand up the lower-angle windward slope and deposition along the steeper slip face side.

Accepted Answer

A) True 
 B)False

Question 3

Dunes covered by very little vegetation probably indicates that the dune is:

Accepted Answer

A)   unstable and active
B)   stable
C)   non-active
D)   transitioning from unstable to stable

Question 4

During deflation, what types of particles are carried away most easily?

Accepted Answer

A)   Angular sand grains
B)   coarsest-grained sand
C)   finest-grained sand
D)   rounded sand grains

Question 5

Wind erosion increases when:

Accepted Answer

A)   the rate of velocity increases slowly above the ground surface
B)   the rate of velocity stays constantly low above the ground surface
C)   the rate of velocity increase reaches 10 mph above the ground surface
D)   the rate of velocity increases rapidly above the ground surface

Question 6

Yardangs are formed when wind:

Accepted Answer

A)   removes all fine particles and exposes the flat bedrock
B)   deposits sand in the form of a ridge
C)   leaves a pavement of flat pebbles on the ground surface
D)   cuts troughs into soft bedrock leaving a ridge of that rock

Question 7

The points or horns of a parabolic dune point _____.

Accepted Answer

A)   upwind
B)   downwind
C)   in a direction perpendicular to wind
D)   all of these

Question 8

Generally, the steepest portion of the dune is the:

Accepted Answer

A)   windward slope
B)   slipface
C)   crest
D)   trough

Question 9

Which factor of wind is the most important in erosion?

Accepted Answer

A)   wind speed
B)   wind direction
C)   both a and b
D)   neither wind speed or direction of wind affects erosion A

Question 10

Surface roughness such as that associated with vegetation will:

Accepted Answer

A)   increase wind erosion
B)   decrease wind erosion
C)   first decrease and then increase wind erosion
D)   none of these, surface roughness does not impact wind erosion

Question 11

Grains are moved by wind through which process?

Accepted Answer

A)   saltation
B)   suspension
C)   surface creep
D)   all of these

Question 12

By which process are silt- and clay-sized grains moved within a stream system?

Accepted Answer

A)   saltation
B)   suspension
C)   surface creep
D)   none of these

Question 13

Longitudinal dunes form in areas with one prevailing wind direction.

Accepted Answer

A) True 
 B)False

Question 14

Wind velocities are _____ near the ground surface.

Accepted Answer

A)   highest
B)   almost zero mpg
C)   fluctuate from near zero to greater than 100 mph
D)   about 10 mph B

Question 15

_____ is an erosional landform where there is a concentration of packed pebbles.

Accepted Answer

A)   dune
B)   deflation hollows
C)   desert pavement
D)   yardangs

Question 16

The following is not an erosional landform produced by winds.

Accepted Answer

A)   dune
B)   deflation hollows
C)   desert pavement
D)   yardang A

Question 17

In a sandstorm, ___ is the dominant mode of particle movement.

Accepted Answer

A)   saltation
B)   suspension
C)   siltation
D)   laminar flow

Exam 47: Wind As a Geomorphic Agent

Barchans form in areas with strong unidirectional winds and a large sand supply.

Correct Answer
verified

The direction in which migrating dunes are moving can be determined by observing the cross-bedding of a dune, formed by the movement of sand up the lower-angle windward slope and deposition along the steeper slip face side.

Correct Answer
verified

Dunes covered by very little vegetation probably indicates that the dune is:

Correct Answer
verified

During deflation, what types of particles are carried away most easily?

Correct Answer
verified

Wind erosion increases when:

Correct Answer
verified

Yardangs are formed when wind:

Correct Answer
verified

The points or horns of a parabolic dune point _____.

Correct Answer
verified

Generally, the steepest portion of the dune is the:

Correct Answer
verified

Which factor of wind is the most important in erosion?

Correct Answer
verified
A

Surface roughness such as that associated with vegetation will:

Correct Answer
verified

Grains are moved by wind through which process?

Correct Answer
verified

By which process are silt- and clay-sized grains moved within a stream system?

Correct Answer
verified

Longitudinal dunes form in areas with one prevailing wind direction.

Correct Answer
verified

Wind velocities are _____ near the ground surface.

Correct Answer
verified
B

_____ is an erosional landform where there is a concentration of packed pebbles.

Correct Answer
verified

The following is not an erosional landform produced by winds.

Correct Answer
verified
A

In a sandstorm, ___ is the dominant mode of particle movement.

Correct Answer
verified

Exam 47: Wind As a Geomorphic Agent

Barchans form in areas with strong unidirectional winds and a large sand supply.

Correct AnswerverifiedShow Answer

The direction in which migrating dunes are moving can be determined by observing the cross-bedding of a dune, formed by the movement of sand up the lower-angle windward slope and deposition along the steeper slip face side.

Correct AnswerverifiedShow Answer

Dunes covered by very little vegetation probably indicates that the dune is:

Correct AnswerverifiedShow Answer

During deflation, what types of particles are carried away most easily?

Correct AnswerverifiedShow Answer

Wind erosion increases when:

Correct AnswerverifiedShow Answer

Yardangs are formed when wind:

Correct AnswerverifiedShow Answer

The points or horns of a parabolic dune point _____.

Correct AnswerverifiedShow Answer

Generally, the steepest portion of the dune is the:

Correct AnswerverifiedShow Answer

Which factor of wind is the most important in erosion?

Correct AnswerverifiedA

Surface roughness such as that associated with vegetation will:

Correct AnswerverifiedShow Answer

Grains are moved by wind through which process?

Correct AnswerverifiedShow Answer

By which process are silt- and clay-sized grains moved within a stream system?

Correct AnswerverifiedShow Answer

Longitudinal dunes form in areas with one prevailing wind direction.

Correct AnswerverifiedShow Answer

Wind velocities are _____ near the ground surface.

Correct AnswerverifiedB

_____ is an erosional landform where there is a concentration of packed pebbles.

Correct AnswerverifiedShow Answer

The following is not an erosional landform produced by winds.

Correct AnswerverifiedA

In a sandstorm, ___ is the dominant mode of particle movement.

Correct AnswerverifiedShow 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
A

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
B

Correct Answer
verified

Correct Answer
verified
A

Correct Answer
verified