deserts and wind eolian - exam 1 Flashcards

1
Q

how does sediment move?

A

water
gravity
ice
wind

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2
Q

a dry area on the lee side of a mountain range

A

rain shadow desert

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3
Q

constant wind direction
limited sand supply

A

barchan dune

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4
Q

constant wind direction
large sand supply

A

transverse dune

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5
Q

converging winds
limited sand supply

A

longitudinal dune

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6
Q

the most important erosional agent non the desert

A

water

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7
Q

wind removes finer grained material and coarse material is left behind as a surface layer

A

desert pavement formation

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8
Q

a cobble or pebble polished and shaped by the sandblasting effect of wind

A

ventifacts

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9
Q

fan shaped deposit of sediment when a stream’s slope is abruptly reduced

A

alluvial fan

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10
Q

an apron of sediment along a mountain front created by the coalescence of alluvial fans

A

bajada

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11
Q

a stream that consists of numerous intertwining channels

A

braided stream

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12
Q

the flat, central area of an undrained desert basin

A

playa

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13
Q

a temporary lake in a playa

A

playa lake

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14
Q

an isolated mountain remnant characteristic of the late stage of erosion in a mountainous arid region

A

inselberg

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15
Q

causes loss of soil and vegetation in a desert

A

blowout

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16
Q

produced when rocks become abraded by windblown sediment

A

ventifacts

17
Q

mounts and ridges of sand formed by sediment carried as part of the wind’s bed load

A

dunes

18
Q

extensive blankets of silt carried by wind in suspension

A

loess

19
Q

the two types of wind deposition

A

dunes and loess

20
Q

the basin and range region is characterized by

A

interior drainage

21
Q

responsible for most of the erosion work in a desert

A

running water

22
Q

the channels are carved largely by flash floods during sporadic storm events, these are called

A

ephemeral streams

23
Q

in dry lands, rock weathering is greatly

A

reduced

24
Q

dry climates cover about __ of earth’s land area

A

30%