Geol. 1403/Cook quiz 14

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GEOL
Chapter 14
Deserts and Wind
updated 1 year ago by Devalon_N_Burk
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geology, science
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1

How are sand grains transported by the wind?

a) high in the moving air column as suspended load

b) by saltation in the first few meters above the land surface

c) by being picked up in swirling dust clouds and carried to distant blowouts

by saltation in the first few meters above the land surface

2

____ refers to the "bouncing" mode of sand transport in na windstorm or stream.

a) saltation

b) ventifaction)

c) siltation

d) deflation

saltation

3

Most dry lands lie between ____ degrees north and south of the equator.

a) 40 and 50

b) 20 and 30

c) 5 and 10

d) 0 and 5

20 and 30

4

Which one of the following statements concerning rock weathering is true.

a) warm temperatures and high soil moisture contents exhilerate chemical weathering

b) low temperatures and high soil moisture contents accelerqte chemical weathering but inhibit mechanical weathering

c) warm tempertures and low soil moisture contents both promote rapid rates of mechanical weathering

d) temperture has no effect on rock weathering

warm tempertures and high soil moisture contents accelerate chemical weathering

5

How is desert pavement formed?

a) deflation removes the coarse fragments leaving behind a layer of loess.

b) alluvial fans are eroded to form inselbergs with rocky surfaces.

c) groundwater in an alluvial fan evaporates leaving behind a surface layer of hard-baked mud.

d) runoff and deflation carry off the silt and clay, leaving coarser particles behind.

runoff and deflation carry off the silt and clay, leaving coarser particles behind.

6

Which one of the following is determined by the angle of repose for dry sand?

a) longitudinal dune gradient angle

b) slope of an alluvial fan

c) a verticle cut bank in loess

d) inclination angle of a dune slip face

inclination angle of a dune slip face

7

Which one of the following statements about sand dunes is correct?

a) a dune migrates in the direction of the slip face

b) the more gently sloping surface is the leeward slope of the dune

c) sand is blown up the slip face and rolls down the more gently sloping flank of the dune

d) in a sand dune, the more gently inclined strata lie parallel to the slip face.

A dune migrates in the direction of inclination of the slip face

8

Deposition of glacial rock flour from blowing winds is responsible for ____.

a) deflation ventifacts

b) blowout pavement

c) star steppes

d) loess deposits

loess deposits

9

Which of the following is one of the best measures of the wetness or dryness of a region?

a) total annual precipitation

b) mean annual temperature

c) difference between annual precipitation and evaporation potential

d) percentage of precipitation that falls during the summer months

difference between annual precipitationn and evaporation potential

10

How is desert pavement formed?

a) deflation and sheet wash remove fine-sized materials leaving coarse, weathered, rock fragments concentrated on the surface.

b) blowing wind removes fine-sized particles, coarser particles abrades to sand size.

c) running water deposits gravel and sand over the finer-sized soil particles

d) intense chemical weathering removes the sand and silt-sized particles, leaving coarse rock debris covering the land surface

deflation and sheet wash remove fine-sized materials leaving coarse, weathered , rock fragments concentrated at the surface.

11

Loess deposits in the central United States ____.

a) blew in from the dry areas in the Great Plains and southwestern desert areas.

b) originated as rock flour in Pleistocene glacial streams and rivers.

c) accumulated from flooding of the Mississippi river

d) were originally deposited as barchanoid dunes and later redeposited by glaciers

originated as rock flour in Pleistocene glacial streams and rivers

12

A ____ is a crescent-shaped dune whose tips point down wind.

a) parabarcal

b) transverse

d) barchan

d) star

barchan

13

During a typical sandstorm, saltating sand grains reach a maximum height of ____ above the land surface.

a) 1 inch

b) 2 meters

c) 10 centimeters

2 meters

14

Which of the following will effectively limit further deflation in a given area?

a) sea level

b) desert pavement

c) a hanging valley

d) the repose level

desert pavement

15

Inselbergs are ____.

a) insulated icebergs floating in a hot spring

b) blowouts cut from bedrock in mountain areas

c) lithified rock be cementation of wind-deposited, dune sands

d) bedrock hills in a highly eroded landscape

bedrock hills in a highly eroded desert landscape

16

A ____ is formed by abrasion of rocks by windblown sand.

a) playa

b) ventifact

c) pediment

d) desert pavement

ventifact

17

____ dunes are long, high sand dunes parallel with the prevailing wind direction.

a) tranducinal

b) longitudinal

c) latitudinal

d) transversal

longitudinal

18

A ____ is an intermittent stream channel in the dry land areas of the western United States.

a) rivulet

b) playa

c) rill

d) wash

wash

19

Which one of the following would probably not affect the size and depth of a blowout?

a) a rise in sea level

b) the near surface water table

c) type and density of vegetation

d) areas of desert pavement

a rise in sea level

20
card image

Match the feature of #20 with the correct answer.

a) transverse dune

b) barchan dune

c) barchanoid dune

d) longitudinal dune

e) parabolic dine

ab) star dune

star dune

21
card image

Match the feature of #21 with the correct answer.

a) transverse dune

b) barchan dune

c) barchanoid dune

d) longitudinal dune

e) parabolic dine

ab) star dune

Barchan dune

22
card image

Match the feature of #22 with the correct answer.

a) transverse dune

b) barchan dune

c) barchanoid dune

d) longitudinal dune

e) parabolic dine

ab) star dune

Transverse dune

23
card image

Match the feature of #23 with the correct answer

.

a) transverse dune

b) barchan dune

c) barchanoid dune

d) longitudinal dune

e) parabolic dine

ab) star dune

Barchanoid dune

24
card image

Match the feature of #24 with the correct answer.

a) transverse dune

b) barchan dune

c) barchanoid dune

d) longitudinal dune

e) parabolic dine

ab) star dune

Longitudinal dune

25
card image

Match the feature of #25 with the correct answer.

a) transverse dune

b) barchan dune

c) barchanoid dune

d) longitudinal dune

e) parabolic dine

ab) star dune

Parabolic dune

26

Complexly shaped dunes formed in resonse to different, seasonal, wind directions.

a) star

b) barchan

c) parabolic

d) barchanoid

e) transverse

ab) longitudinal

star

27

Linear sand ridges at right angles to the prevailing wind direction.

a) star

b) barchan

c) parabolic

d) barchanoid

e) transverse

ab) longitudinal

transverse

28

Linear sand ridges parallel to the prevailing wind direction.

a) star

b) barchan

c) parabolic

d) barchanoid

e) transverse

ab) longitudinal

longitudinal

29

Multiple, connected, crescent-shaped coastal dunes with the tips pointing towards the beach.

a) star

b) barchan

c) parabolic

d) barchanoid

e) transverse

ab) longitudinal

barchanoid

30

Sand ridges at right angles to prevailing winds with crescent-shaped slip faces pointing downwind.

a) star

b) barchan

c) parabolic

d) barchanoid

e) transverse

ab) longitudinal

barchanoid

31

Single, crescent-shaped dune with the tips pointing downwind.

a) star

b) barchan

c) parabolic

d) barchanoid

e) transverse

ab) longitudinal

barchan