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45 Cards in this Set

  • Front
  • Back
~Region w/ low precipitation
~Usually less than 25 cm of rain per yer
descending air
Deserts distribution is related most to
Desert distribution
~Belts at 30 degrees North and South latitude
-Polar desserts
-Not on Equator
Deserts occur great distances from
cold ocean currents
Deserts occur in tropical coast next to
Characteristic of desert
(Sparse Vegitation)
- Drought tolerant
- Deep Rooted
- Thick cuticled leaves or no leaves
Characteristic of desert
(Lack of through-flowing streams)
-Internal Drainage
-Local base levels
Characteristic of desert
(Dessert Thunderstorms)
- Paralled cliff retreat- running water in a dessert: where the greatest amount of erosion occurs (even more than wind)
Charactertic of desert
(Flash floods)
-dangers in slot canyons
Characteristic of desert
(Resistance of rocks to weathering)
-desert topography typically steep and angular
-plateaus held up by resistant rocks
-erode 2 mesas and buttes
Characteristic of desert
(Stream channels normally dry:arroys)
-covered w/ sand and gravel
-narrow, slot canyons w/ vertical walls
Examples of parallel cliff retreat in u.s. dessert
plateaus, mesas, buttes
Colorado plateau
-mostly flat lying sedimentary beds
-most erosion occurs during infrequent rains
2 major dessert regions of the U.s. Southwest
-Colorado plateau
-Basin and Range Providence
Basin and Range province ( nearly all Neveda)
-Alluvial fans at slope breaks coalesce to form a bajada
-playa lake
playa lake
an internal drained lake
the deposit/mud and evaporate minerals
Death Valley
-A fault-bounded valley in southern California (Basin and Range)
-More than 250 below sea level
-Mudcracks, salt and other evaporate deposits
Dust storms
moves "fines" out of source area
sand stays close to
source area
sand moves along ground by
rocks 2 large 2 move
-Controlled by water table
one meter
Sandblasting above ground up to
Strong wind action
100 km/h
reasons for strong wind action in the desert
-low humidity
-great temperature ranges
-more effective b/c of lack of vegitation
reasons for effective erosion in deserts
-sediment is dry (no surface tension)
-sand is more easily eroded than silt or clay sized particles
-Fines are carried much farther
deposits of wind blown "fines"
Desert pavement
the gravel that the wind cannot move
loess is harder to erode than
Loess travels by
suspension farther (may go 100's of miles from source)
Desert Varnish
Very fine, wind-blown material may form as
Desert Varnish on rock surfaces
Iron and Manganese oxide coatings on wet rock surfaces
Barchan dunes
- formed where sand supply is limited
- horns point in down-wind direction
Transverse dunes
-more sand and elongate form
-wave perpendicular to wind pattern
Parabolic dunes
-Requires abudant sand-beaches
-horns point in up-wind direction
-Commonly form around a blowout
longitudinal or sief dunes
-large: to 650 high and 75 miles long
-Parallel to wind
fines but settles first
sand erodes easier than
A ventifact
not a depositional feature
slip face
Dunes migrate in the direction of their
The lower limit of a "blowout"
the water table
sand dunes sand
-well sorted,well rounded, frosted sand grains
-saltation movement over the gentle slope to the slip face
steep beds (cross beds)
sand is deposited in
slip face
-angle of repose
-this surface "faces" down wind
the gentle surface
in sand dunes wind ripples may occur on