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Exam 14: The Work of Wind and Deserts

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Question 31

Multiple Choice

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Dunes that form when vegetation cover is broken by deflation and the dune tips point upwind are:

A) longitudinal.
B) transverse.
C) barchan.
D) parabolic.
E) none of the above

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Question 32

Multiple Choice

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The close-fitting mosaic of pebbles,cobbles,and boulders covering the floor of many deserts and semiarid regions is called:

A) ventifacts.
B) desert pavement.
C) longitudinal dunes.
D) yardangs.
E) barchan dunes.

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Question 33

Multiple Choice

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Deserts mostly occur at ____ latitudes.

Dunes that form long-parallel ridges of sand aligned generally parallel to the direction of the prevailing winds where sand supply is somewhat limited are ____________________ dunes.

The drainage characteristic of most deserts in which streams dry up and do not have enough water to become integrated and reach outside their drainage areas is called ____________________ drainage.

Although loess may originate in deserts,it is not deposited in them.

Desertification is taking place in the Sahara but not in the developed world.

Briefly explain why sand is moved by wind before clay and silt during wind erosion.

How does saltation by wind differ from that in streams?

Wind erosion appears to be most important in the formation of pediments.

What produces the worldwide pattern of east-west-oriented wind belts?

High pressure troughs exist where cooler,denser air begins to descend at about ____________________ to ____________________ degrees latitude,N and S.

How do sand dunes migrate?

Although loess forms in only a few environments,it covers approximately ____________________% of Earth's land surface.

Long,parallel ridges of sand aligned parallel to the wind direction are:

In the desert,wind is a more effective agent of erosion and deposition than water.

Loess is important because it:

Long,parallel ridges of sand aligned perpendicular to the wind direction are:

Wind erodes by:

An erosional bedrock surface of low relief that slopes gently away from a mountain base is a(n) :