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