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31 Cards in this Set

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eolian processes are 4
wind driven
ineffective on vegetation
main important in dessert regions
can be important culturally
how particles travel
big ones creed by wind, others get carried high into atmosphere
saltation
movement of sediment by wind
sand ripples
unstable smaller grains on top or the small ridges they create
eolian process speed
tons of sediment moved rises exponetially with wind speed
surface creep
grains rolling
deflation
movement of individual loose particles
yardang
elongate wind eroded ridge
deposition
dropping sediment, happens when wind slows down like on lee side of objects
erg desert
sand sea
stoss face
the windward side
8 dune types
between the parabolic boys lauren sat drying rats or barchan, transverse, parabolic, barchanoid ridge, longitudinal, star, dome, reversing
barchan
Crescent shape
Horns point downwind
Transverse
Asymmetrical ridge
Right angle to wind
Longitudinal
Long, ridge shape
Two slipfaces
Parallel to wind
star
Giant of dunes
Multiple arms, slipfaces
Parabolic
Open end faces upwind
Vegetation important
loess
Pronounced “luss” from the German word for “loose”
Wind-deposited dust consisting largely of siltOriginates in deserts and floodplains of glacial meltwater streams
Humid regions deserts
Chemical weathering
Fine grain
Vegetated
Smooth slopes
arid region deserts
Mechanical (physical) weathering
Coarse grain
Abrupt breaks at joints
Bare
Steep, angular slopes
alluvial fans
Sediment dropped by water transport at the mouth of a canyon, where it exits into a valley
bajada
Forms when alluvial fans merge
playa
Low area in a region of closed drainage
Usually an intermittent lake
pediment
A broad, relatively flat bedrock surface sloping away from higher land
pediment formation
1. mountain uplife
2. mtn erodes from both sides
3. pediment consumes the mtn leaving a few residual hills.
Inselberg
Steep-sided mountain or isolated hill arising abruptly from adjacent plain
horst
uplifted block
graben
downfaulted or not uplifted
laminar flow
smooth wind flow close to ground
ventifacts
Ventifacts: any rock surface that was been abraded and shaped by wind-blown sediment
tephra
pulverized rock and other materials ejected by volcano