Multiple Choice Questions for Deserts and Winds - Chapter 13Each chapter will include a few questions designed to test your knowledge of material covered in the chapter and in the Internet-based resources. Your answers are not being recorded. Try the following. Geologic processes powered by the wind are called __________ processes.barchancorioliseolianyardangTurbulence of air increases in proportion to the ___________ of the air flow.volumevelocityaccelerationdistanceDue to the Coriolis effect, any current of air or water is deflected to the ____ in the northern hemisphere and to the _____ in the southern hemisphere.eastern ... easteast ... westwesns ... eastwesns ... westThe Earth rotates from _______ to _______ .wesns ... easteast ... westnorth .... southsouthern ... northSand grains saltating in air can jump higher than sand grains saltating in water because ___________ . water is less dense than airair is less viscous than waterwind velocity is faster than water velocitygrains are suspended in air longer than they are in waterWhich of the following is an important source of dust?volcanic dust from eruptionsclay minerals from soilsorganic sources, including charcoal, pollen and bacteriaall of theseCross beds in a lithified dune dip to the west. During deposition of the sand, the prevailing winds were probably from the __________ .eastwestnorthsouthLarge dune fields, or seas of sands, are called _______ . draasbarchansregsergsDeserts with a pebble surface are called _________ . draasbarchansregsergsWhich of the following are not related to wind erosion?loessventifactdeflationblowoutThe loess deposited in the upper Mississippi Valley was derived primarily from ________ . volcanic dustdesert regions lying to the westglacial depositscoastal sand dunesWhy does volcanic dust tend to travel further than wind-blown dust derived from the continents?because volcanic dust is erupted high into the atmospherebecause volcanic dust is less dense than dust derived from the continentsbecause volcanic dust is composed of quartz whereas dust derived from the continents is composed of feldsparall of theseThe Great Basin and Mojave deserts of western North America exist primarily _________ .because they lie near the equatorbecause they lie thousands of kilometers from the oceanbecause they lie in the rainshadow of coastal mountainsall of theseMuch of a desert"s surface consists of sand, gravel, and rock rubble because _________ . clay minerals form slowly in a desert environmentwind blows away clay and soil before it can accumulate to great thicknessvegetation is sparse and cannot prevent erosion of soilall of theseWhich of the following would you least expect to find in a desert?playa lakesrounded, soil-covered hillssteep river valleys and gorgesdune fieldsWhich of the following is not a wind deposit?pedimentsand duneloessall of these are wind depositsA broad, gently-sloping platform of bedrock that is left behind as a mountain front is eroded is called a(n) ___________ .pedimentalluvial fanmesaergWind speeds of 117 kilometers per hour or more constitute a _______moderate to strong breezemoderate to strong galewhole gale to stormhurricaneIn temperate zones of the Earth between 30o and 60 o latitude, the prevailing winds come from the ________.northsoutheastwestIn the figure above, the letters A through D represent wind names. Which of the following is false?
A and B represent the "westerlies"A and C represent "trade winds"C and D represent "trade winds"none of these statements are falseRipples are generally oriented ________ to the current directionparallel30 degrees45 degreesperpendicularIn a large dust storm, approximately how much dust can 1 cubic kilometer of air carry?1 ton10 tons100 tons1000 tonsFine-grained dust particles from the eruption of Mr. Pinatubo remained in the atmosphere for how long?1 - 2 months3 - 4 months1 -2 years3 - 4 yearsWhite Sands National Monument contains sand dunes made up of _________?quartzgypsumorganic sources including pollen and bacteriafeldsparWhat is the primary cause of frosting on the surface of quartz sand grains?impacts with other sand grainsabrasion by air currentsslow dissolution by duenone of theseWhich of the following statements is false?wind is a more effective erosion agent in wet climateswind is a more effective erosion agent in dry climateswind is an equally effective erosion agent in wet and dry climateswind does not cause erosionThe process by which the ground surface is lowered by wind erosion is called _______.deflationinflationablationnone of theseWhich of the following will not accelerate deflation?established vegetationconstructionmotor vehicle tracksplowingHow does desert pavement form?by intense chemical weatheringby stream erosionby intense mechanical weatheringby wind erosionYardangs are:sand dunes arranged in long, parallel rowseroded bedrock with long, parallel grooveslong, parallel ridges eroded by dustnone of theseWhich of the following promote the development of sand dunes?strong windsa supply of loose sanddry climateall of theseSand will accumulate ___________.on the lee side (downwind) side of a boulderon the windward side (upwind) of a boulderon both the lee side and the windward side of a boulderboulders cannot cause sand to accumulate
Given the relative positions of the sand dune and rock shown here, the wind direction is predominantly ___________north to south to northeast to westwest to eastThe steeper, downwind side of a sand dune is called a _________.sand driftventifactslip facestreamlineA cross bed preserved in an eolian sandstone represents _________.the top of a former sand dunethe bottom of a former sand dunethe upwind side of a former sand dunethe downwind side of a former sand dune
This sand dune is a _______ dunebarchantransverseblowoutlinearThe wind direction which would create this dune is __________.north to southsouth to northeast to westwest to eastIn a barchan dune, the points of the crescent point ______ and the slip face is the ________ downwind curve of this duneupwind .... concaveupwind .... convexdownwind ....
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concavedownwind ..... convexSand dunes behind beaches are typically_______.barchantransversebarchanslinear dunesDuring erosion loess tends to break off __________.in horizontal layersin vertical sheetsalong irregular cracksslowly, grain by grainWhich of the following is not related to wind erosion?loessventifactsdeflationblowoutsLong sand ridges that are more or less parallel to the prevailing wind are called ______.barchan duneslinear dunestransverse dunesblowoutsThrough geologic time the interior of Australia has changed from a moist, humid climate to a desert becauseplate collisions have built mountains near the coast line which block moisture-bearing winds from the continent"s interiorAustralia has moved northward into an arid, subtropical zoneAustralia has moved southward out of the part of the more humid trade windsthe continent has grown through volcanic activity making the interior too far away from moisture-bearing windsRadar imaging from the space shuttle Endeavor has provided evidence that the Sahara Desert __________.has always been an arid environmentwas once tropical with many different types of vegetationonce had an extensive system of river channels which are now dryhas sand dunes in excess of 300 m in heightThe transformation of semi-arid regions into deserts is called _______.deflationdeforestationdetoxificationdesertificationWhat minerals are responsible for the orange-brown colors of weathered surfaces in the desert?quartzalkali feldspariron oxidesall of theseApproximately what percentage of the world"s deserts are covered with sand?5%20%50%100%A wadi is a ________shallow lakeplaya with salt sedimentsdry washflood depositsA mesa is __________flood deposit in a small dry washa flat plateau surrounded by steep cliffsmountain showing horizontal sedimentary layeringa pediment with an alluvial fan coverTry these fill-in-the blanksReturn to the Physical Geology Home Page