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Ch 7
Test Description: Earth Science
Instructions: Answer all questions to get your test result.
1) What is a blowout?
A
a shallow depression caused by deflation
B
a stony surface layer caused by deflation
C
a stony surface layer caused by abrasion
D
a shallow depression caused by abrasion
2) How does wind transport sand grains
A
by saltation as part of the bed load
B
wind transport sand grains only during dust storms
C
Equal quantities are transported suspended in the air and as bed load
D
mainly as part of the suspended load
3) When wind creates a sand dune, the sheltered side of the dune
A
has the same incline as the windward side
B
is steeper than the windward side
C
has no incline
D
has a more gently sloping angle than the windward side
4) Over time, sand dunes tend to migrate
A
toward the wind
B
perpendicular to the movement of the wind
C
in the same direction as the wind blows
D
in random directions
5) If the steep face of a sand dune is on the southeast side of the dune, then the prevailing wind in this area is from the
A
southwest
B
northwest
C
northeast
D
southeast
6) The thick loess deposits in South Dakota, Nebraska and Iowa
A
are composed of windblown sand
B
had their source as glacial sediments
C
are in the form of tranverse dunes
D
had their source in desert regions of the west
7) Sand dunes that form scalloped rows of sand at right angles to the wind are called
A
star dunes
B
barchanoid dunes
C
parabolic dunes
D
transverse dunes
8) Long sand ridges that are oriented more of less parallel to the prevailing wind are called
A
transverse dunes
B
barchan dunes
C
parabolic dunes
D
longitudinal dunes
9) (in your book p 206 figure 22) Which diagram illustrated lingitudinal lines?
A
D
B
A
C
B
D
F
10) What type of sand dune would most likely form if the sand supply is limited, the wind direction is constant and vegetation is sparse
A
barchan dunes
B
star dunes
C
transverse dunes
D
longitudinal dunes
*select an answer for all questions
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