Exam 18: Arid Region and Eolian Landforms

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Why are washes prone to flash floods? ​

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Desert slopes are largely unprotected by vegetation, and thin soils limit infiltration rates. While annual rainfall in deserts is low, individual rain events can produce large amounts of runoff that gets rapidly funneled into washes.

Compared to sandstorms, dust storms _____. ​

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C

Desert basins of interior drainage surrounded by mountains are called _______________. ​

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bolsons

Name a type of sand dune that could form in each of these conditions: an area with abundant sand supply and winds that blow from a constant direction, an area with bidirectional winds blowing from neighboring quadrants (such as northwesterly and southwesterly), and an area with winds that blow from varying directions. ​

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Where could you generally find rich soils with the potential to be transformed into productive agricultural lands in arid regions? ​

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A coalesced apron of alluvial fans along the base of desert mountains is called a(n)_______________. ​

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Particles that are too large to be carried in eolian suspension are bounced along the ground as part of the bed load in the transportation process of _______________.

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Playas form wherever there is an inselberg. ​

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Fluvial processes do more geomorphic work in arid lands than the wind does. ​

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Caprocks are _____. ​

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If the vegetation cover on a stabilized dune is breached, perhaps from damage by range animals or off-road vehicles, the wind can then remove some of the sand, creating a depression called a(n)_____.

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The competence of moving air is generally limited to rock fragment that are sand sized or smaller.

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Stream systems of interior drainage _____. ​

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How do alluvial fans form? ​

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Eolian transport can move sediment in suspension. ​

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In arid regions, the wind is commonly able to pick up sand-sized particles and carry them high up in the air in suspension. ​

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Desert bolsons would most likely have _____. ​

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How do sand dunes migrate? ​

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Over time, a butte may be eroded to form a mesa. ​

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How is a pediment different from an alluvial fan? ​

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