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65 Cards in this Set

  • Front
  • Back
a region so dry that it contains no permanent streams and very little vegetation
a wavering pool of light on the ground
the dry air found on the leeward side of a mountain due to rain catching on the seaward side.
rain shadow
dark rusty brown coating of iron oxide, manganese oxide and clay that cover rocks in the desert
desert varnish
symbols and pictographic figures cut into desert varnish
dry stream channels in desert regions
dry washes or arroyos
fine grained sediment such as dust and silt held in suspension
suspended load
moderate to strong winds can roll and bounce sand grains along the ground - a process called...
saltating sand consitutes the winds....
surface load
an accumulation of coarser sediment left behind when fine-grained sediment blows away
lag deposit
a natural formation of separate strones that fit together tightly
desert pavement
rocks whose surface has been faceted by the wind are faceted rocks
where resistant rocks overlies softer rock wind abrasion can create mushroom like columns with the resistant rock on top
the process of lowering the land surface by wind erosion
the shape of the land surface twists the wind into a turbulent vortex that causes enough deflation to scour a deep bowl-like depression
debris of rock that acumulate at the base of a hill
talus apron
a fan of distributaries spreads the sediment in a wedge shape
alluvial fan
alluvial fas that overlap and form an elongate wedge of sediment
a flat dry lake bed
a basin with no outlet to the sea
interior basin
dust that accumulates forming layers of finegrained sediment
sand in piles
when cliffs erodebut the cliff face retreats but retains roughly the same form
cliff retreat
large plateaus of rock with a top surface area of several square km
medium sized plateau
small examples of plateaus
where bedding dips at an angle to horizontal, flat topped mesas and buttes dont form, asymmetric ridges form instead
when the bedding dip is steep to near vertical , a narrow symmetrical ridge
when all that remains of a cliff is a small island of rock surrounded by alluvium filled basins its called
bedrock surfaces that extend outward like ramps from the steep cliffs of a mountain range on one sides to an alluvium filled valley on the other
plants that store water for long periods of time
process of transforming nondesert areas to desert
boulders that are out of place and seem to have traveled a great distance to their resting place
slowly flowing masses of ice that survive the summer melt
vast glaceirs that had one covered much of the continent
ice sheets
time when the climate was significantly colder
ice age
something that reflects light well (like ice)has a high
glaciers that exist near a mountain range
mountain glaciers
glacers that fill bowl-shaped depressions
vast ice sheets that spread over thousands of sq km of continental crust
continental glaciers
glaciers that form where atmospheric temperatures become high enough druing a substantial portion of th year for the glacial ice to be at or near its melting point
temperate glaciers
glaciers that occur in regions where atmospheric temps stay so low that the ice is frozen almost permanently
polar glaciers
evaporate directly into vapor
packed granular material (snow about to form a glacier)
basal sliding is the basic mode of movement of this type of glacier
wet-bottom glacier
internal flow is the dominate type of movement of this type of glacier
dry-bottom glacier
a large crack in the ice
when a glacier moves faster for a short period of time
removal of ice by sublimation
snowfall that is added to a glacier in a specific area
zone of accumulation
area where sublimation occurs
zone of ablation
boundary between the zone of acuumulation and the zone of ablation
equilibrium line
leading edge or margin of a glacier
if the rate of ice that accumulates excedds the rate of ablation then ______ occurs
glacial advance
if the rate of ablation exceeds the rate of accumulation
glacial retreat
continental glaciers that enter the sea become
ice shelves
floating chunk of ice
when the surface of the sea itself freezes
sea ice
larger rocks that drop from the ice to the sea floor
drop stones
when glaciers are abraded(rasped) by sand
glacially polished surfaces
rasping by large clasts
glacial striations
when a cirque melts it forms a
a ridge of rock separating 2 adjacent cirques
a pointed mountain peak surrounded by at least 3 cirques