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Definition
| air loses moisture as it rises over mountains producing rain shadows on the downwind side. |
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Definition
any reagion with low rainfall
less than 25 inches
aridity index of 4 or greater |
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Definition
| many desert regions have internal drainage into low lying basins, forming playa lakes |
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Definition
| this high runoff can create sudden local floods of high discharge and short duration |
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Definition
| broad, flat topped areas elevated above the surrounding land and bounded, at least in part, by cliffs. |
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Definition
| a broad, flat topped hill bounded by cliffs and capped with a resistant rock layer |
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| a narrow hill of resistant rock with a flat top and very steep sides. |
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Definition
| fractures in the ground along which some movement as taken place |
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Definition
| build up where stream channels abruptly widen as they flow out of narrow canyons onto the open valley floors, causing a decreasing in velocity and rapid deposition of sediment |
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Definition
| iif no outlet drains the valley, runoff water collects on valley floor |
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Definition
| a broad, gently sloping depositional surface formed by the coalescing of individual allubial fans |
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Definition
| gently sloping surface commonly covered with a veneer of gravel, cut into the solid rock of the mountain |
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Definition
| rocks with flat, wind-abraded surfaces |
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Definition
| the removal of clay, silt and sand particles from the land surface by wind |
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Definition
| a depression on the land surface caused by wind erosion |
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Definition
| a deposit of wind blown silt and clay composed of unweathered, angular grains of quartz, feldspar, and other minerals weakly cemented by calcite. |
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Definition
| mounds of loose sand grains piled up by the wind |
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Definition
| the steep downwind slope of a dune |
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Definition
| dune that develops where the sand supply is limited. |
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Term
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Definition
| a relatively straight, elongate dune oriented perpendicular to the wind direction |
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Definition
| somewhat similar in shape to a barchan dune, except it is deeply curved and is convex in the downwind direction |
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Term
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Definition
| large linear dunes parallel to wind direction, cross winds are likely important as well |
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Definition
| dry stream beds through most of the year can become full rapidly during flash flooding events |
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Definition
| produces strong rain shadow effects |
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Term
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Definition
| fault block bounded mountain ranges with valleys in between |
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Definition
| region of flat lying sedimentary rocks at high elevation |
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Term
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Definition
| uplifted fault blocks that form mountain ranges |
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Term
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Definition
| downdropped fault blocks forming valleys inbetween |
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