Chapter 15- Geography (Earth Science)
Which of the following is true of loess deposits?
They are formed of fine-grained clays and silts
The suspension of finer particles by wind over significant distances is a phenomenon known as
a dust storm
The sandblasting action of wind-blown particles is called
abrasion
The term eolian refers to
erosion, transportation, and deposition by wind
If precipitation events occur in a desert, a dry streambed can fill with a torrent called a _________ and the dry streambed is known as a ________
flashflood; wash
The ability of the wind to move materials
is small compared to others transporting agents, such as water and ice.
The spatial distributions of Earth's dry regions are attributable to all of the following factors except
the equatorial low pressure region and the ITCZ
About _______ are of desert areas are covered with sand?
10%
Clay is easy to life from a surface and also is easy to keep suspended in the air.
False
In China, the desert pavements are called _____.
Gobi
Which of the following surface conditions could limit the effectiveness of wind as an erosional agent?
Surface materials consisting of clay-sized particles.
Desertification is caused by
-poor agricultural practices -deforestation -global climate changes
Which of the following is not true of alluvial fans?
They frequently occur in the eastern US.
A desert is an area in which potential evapotranspiration rates exceed actual evapotranspiration rates
True
The formation of desert pavement involves both wind and water
True
The rate of sand movement is proportional to wind speed
True
The skipping and bouncing action of saltation accounts for about 80% of wind transported particles
True
the saltating particles can initiate movement of other particles
True
List three classes of dune forms ______, ______, and _______.
cresentic, linear, and star
Which two processes create desert pavement?
deflation and rain wash
Removal of vegetation from a semiarid grassland environment is likely to lead to
delfation
The removal and lifting of individual loose particles by the wind is termed
delfation
Pebbles can be moved by _______ in a process known as ________.
saltating particles; surface creep
In which region of the U.S. are eolian processes most effective?
southwest
Elongated, streamlined ridges aligned parallel to the most effective wind direction are called
yardangs
Which side of a dune typically has a slope angle equal of that of the angle of repose for sand?
leeward side
Which of the following grain sizes is most readily moved by the wind?
intermediate
Desert landscapes tend to be _______ in appearance because of the _______
rugged and hard-edged; lack of water erosion
What size material comprises the dust in a dust storm that extends thousands of feet above ground?
silts and clays
Desert pavement refers to
surfaces of concentrated pebbles and gravels