Chat with AIExam 14: The Work of Wind and Deserts
Briefly explain how mesas and buttes form.
(76) 
VerifiedA nearly horizontal resistant layer of rock is breached by weathering and erosion,allowing the underlying less resistant layers to be rapidly eroded.The flat-topped,steep-sided erosional remnants are mesas,and further erosion leaves the pillar-like structures called buttes.
Describe sediment transport as bed load,including saltation.
(84) VerifiedBed load contains sand and larger particles that are too heavy to be carried in suspension.Transport is by saltation or by rolling and sliding.Saltation occurs when wind starts sand grains rolling and lifts and carries some grains short distances before they fall back to the ground.Falling sand grains strike other grains on the surface,causing them to bounce along.Once saltation begins,the grains continue to move even if the wind speed drops because the collisions continue to occur.
____________________ involves the impact of saltating sand grains on an object.
(76) VerifiedAbrasion
Regions that receive more precipitation than arid regions but are moderately dry are ____________________ regions.
(84) Since most deserts have internal drainage,why are there through-flowing streams,such as the Nile,Niger,Indus,and Colorado Rivers in some deserts?
(87) Why is wind unable to transport sediment with the same grain size competency as water?
(64) Air flows from ____________________ pressure regions to ____________________ pressure regions.
(72) Wind deposits composed of sand-sized particles that are deposited near their source are called ____________________.
(70) The deflection of a moving mass from a straight line is known as the ____________________.
(75) How much land area is converted to deserts globally each year?
(85) The most effective agent of erosion in the deserts is ____________________.
(95) How does air flow with regard to air pressure? How would air flow on Earth if the planet didn't rotate? How does air flow since it does rotate?
(83) Dunes that form long ridges perpendicular to the prevailing wind direction in areas with abundant sand and little vegetation are ____________________ dunes.
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