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what are the classifying agents of a desert?
regions with little rainfall + vegetation
have bare/loose dry material
what are the 3 ways air moves?
1. streamlined
2. turbulent
3. vortices
what is deflation?
removal of loose particles by windwhat is
what is abrasion?
bombarding of surfaces by particles carried by the wind
what is this?
deflation hollow and pan
what is this?
yardangs → streamlined ridges parallel to wind
what is this?
zeugan
what is this?
ventifacts
what are the characteristics of wind as a geomorphic agent?
less dense + viscous than water
can only move find non cohesive material
very well sorted sediment
what is the relationship between air movement and height?
air gets faster as you go up since there is more friction towards the ground
why is wind faster in open terrain than urban areas?
there is less friction on the ground
how does desert pavement form?
1 - wind removes fine material, leaving only coarse
2 - continued deflation concentrates larger material
3 - surface protected by large stones
what are the smallest depositional landforms?
ripples
perpendicular to wind direction
what are these?
transverse dunes
unimodal wind + lots of sand
what are these?
barchanoid ridges
what are these?
barchan dunes
what are these?
domes dunes
what are these?
linear dunes
parallel to wind
what are these?
star dunes
very high sediment + complex winds
what are these?
dune networks
very complex + turbulent winds
what are these?
leedunes + foredunes
what are these?
climbing dunes
perpendicular to ridges
what are these?
parabolic dunes
need to be anchored by vegetation
what are these?
lunettes
what are these?
nabkha
what is a loess?
terrestrial sediment composed of windblown silt
highly erodible due to fin particle sizes
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