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31 Cards in this Set
- Front
- Back
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A ___ is a dry or arid region with less than 25 cm of rainfall a year.
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Desert
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The lack of vegetation makes materials more susceptible to ____ and ____
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Mechanical Weather and Erosion
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The location of deserts is weather consisting of _____
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Dry air
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Desert streams usually flow ____
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Intermittently
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Many deserts drain towards landlocked basins and toward the sea due to ____
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Internal Drainage
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Sudden local floods of high discharge and short duration during high run off is called ____
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Flash floods
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The arid climate of the southern U.S. is caused by a)___ and b)____
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30 degree N. latitude and the rainshadow effect.
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Broad flat topped areas elevated above surrounding land and bounded by cliffs are called ____
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Plateaus
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Remnants of resistant rock may be left behind causing forming flat topped ____ and ___
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Mesas and Buttes
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A broad flat topped hill bounded by cliffs and capped with resistant rock layer is called a ____
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Mesa
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A narrow hill of resistant rock with a flat top and steep sides is called a _____
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Butte
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A sharp ridge that has steep slopes is called a _____
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hogback
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A ridge with one steep side and one gently sloping side is called _____
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cuesta
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Fractures in the ground where movement takes place is called a
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Fault
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Rock debris from mountains, picked up from flash floods and mud flows is deposited at the base of the mountain resulting in ___
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Alluvial Fans
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Wind can only erode fine sediment such as ___ and ___ due to low density.
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Silt and Clay
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During sandstorms, ____ can blast smooth surfaces on hard rock.
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Sandblasts
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Rocks with wind abladed surfaces are called
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Ventifacts
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Wind blown sand can sculpt isolated pebbles, cobblestones, etc. into ____
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Ventifacts
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Wind erodes in 2 ways: 1)____ and 2)___
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Abrasion and Deflation
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The removal of loose sediment of the wind is called ___
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Deflation
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Modifies existing features of a rock by putting, smoothing and etching.
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Abrasion
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A depression on sand caused by wind erosion.
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Blowout
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____ can continue to deepen a blowout in fine grained sediment until it reaches wet sediment at the water table.
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Deflation
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The effects of gravity and occasional floodwaters rearrange the remaining particles into a mosaic of rocks called ____
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desert pavement
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Sand grains are usually ____ and ____ because of how selective wind is at moving sediment.
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Well-sorted and Well-rounded
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Sand dunes are usualy comprised of _____ grains
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Quartz
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Mounts of loose grains compiled by the wind are called___
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Sand dunes
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The steep downwind of a slop is called the ___
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slip face
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Mosy dunes form ____ due to their high angle
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Cross-bedding
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Small, low, ridges of sand produced by the saltation of grains is called ____
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Wind ripples
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