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36 Cards in this Set
- Front
- Back
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What are the special conditions in deserts?
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-Weathering
-Soil & regolith (rocky terrain) -Soil creep (produces slopes) -Impermeable surfaces (little moisture seeps into ground -Sand (stream and overland flow/ influenced by winds) |
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What influences special conditions to occur in deserts?
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-Rainfall
-Deposition -Wind -Drainage -Vegetation |
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Most important agent for landform development
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Water
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Dry lake bed in a basin of interior drainage
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Playa
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Dry lake bed taht contains an unusually heavy concentration of salt in the lakebed sediment
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Salina
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Playa surface that is heavily impregnated with clay
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Claypan
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Shallow and short-lived lake formed when water flows into a playa
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Playa Lake
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A salt lake, commonly caused by interior stream drainage in an arid environment
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Saline Lake
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The process whereby different rocks or parts of the same rock erode at different rates
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Differential erosion (caused by rock type & structure)
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Island mountain, isolated summit rising abruptly for a low-relief surface
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Inselberg
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A rounded or domal inselberg composed of resistant rock that stands above surrounding terrain bc of differential erosion and weathering
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Bornhardt
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Gently inclined bedrock platform that extends outward from a mountain front, usually in an arid region
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Pediment
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Zone at the "foot of the mountains"
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Piedmont
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Pronounced changed in the angle of a slope at a mountain base, with a steep slope giving way abruptly to a gentle one
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Piedmont angle
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Large area covered with loose sand arranged in some dune formation by the wind
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Erg
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Desert surface of coarse material from which all sand and dust have been removed by wind and water erosion
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Reg
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Processes related to wind action (mostly in dry lands)
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Aeolian Processes
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Shifting of loose particles by wind blowing them into the air or rolling them along ground
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Deflation
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Shallow depression from which an abundance of fine material has been deflated
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Blowout
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Process by which wind erodes rock through contact between rock and small particles carried by wind
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Abrasian
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The steeper leeward side of a sand dune
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Slip Face
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Crescent-shaped dune with the tips of the crescent pointing downwind
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Barchan Dune
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Chain of interconnected barchan dunes located in areas of abundant sand
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Transverse Dune
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Long, narrow desert dunes that usually occur in multiplicity and parallel arrangement
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Seif Dunes
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Fine-grained, wind-deposited silt
("bread baskets") |
Loess
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2 most common desert landforms in the U.S.
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1) Basin-and-range terrain
2) Mesa-and-scarp terrain |
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What are the 3 principle features of basin-and-range terrain?
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-Basins
-Piedmont zone -Mountain zone |
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Deposition laid down by a stream issuing from a mountain canyon
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Alluvial Fan
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Continual alluvial fan that resembles connected chain of alluvial fans
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Bajada
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Flattish, lower area between ranges
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Basin
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Smallest to largest Mesas
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Pinnacle, Butte, Mesa, Plateau
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Flattish erosional surface formed of the most resistant layers of horizontal sedimentary or volcanic strata
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Caprock
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Barren terrain of arid and semiarid regions, characterized by a multiplicity of short, steep slopes
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Bedlands
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Forms from the erosion of the lower portion of a sedimentary rock, leaving hard-capped, erosion- resistant material above
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Arch
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Forms from a change from erosion-resistant to less erosion-resistant rock over which water flows
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Natural Bridge
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Continuously trickling rainwater eroding layers of erosion-resistant rock, leaving hard-capped materials remaining above
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Pedestals
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