When Wind Drops Its Load of Sand It Can Form a Hill Called a Written By Hennings Clagre Wednesday, February 16, 2022 Add Comment Edit Geologic processes powered past the air current are chosen __________ processes. barchan coriolis eolian yardang Turbulence of air increases in proportion to the ___________ of the air flow. volume velocity acceleration altitude Due to the Coriolis outcome, any current of air or water is deflected to the ____ in the northern hemisphere and to the _____ in the southern hemisphere. east ... e due east ... due west due west ... e west ... westward The World rotates from _______ to _______ . west ... east due east ... due west n .... s south ... northward Sand grains saltating in air can leap higher than sand grains saltating in water because ___________ . water is less dumbo than air air is less viscous than water wind velocity is faster than water velocity grains are suspended in air longer than they are in water Which of the following is an of import source of grit? volcanic grit from eruptions clay minerals from soils organic sources, including charcoal, pollen and bacteria all of these Cross beds in a lithified dune dip to the w. During deposition of the sand, the prevailing winds were probably from the __________ . e west north s Large dune fields, or seas of sands, are called _______ . draas barchans regs ergs Deserts with a pebble surface are chosen _________ . draas barchans regs ergs Which of the following are not related to air current erosion? loess ventifact deflation blowout The loess deposited in the upper Mississippi Valley was derived primarily from ________ . volcanic grit desert regions lying to the west glacial deposits coastal sand dunes Why does volcanic grit tend to travel further than current of air-diddled grit derived from the continents? considering volcanic dust is erupted loftier into the atmosphere because volcanic dust is less dumbo than dust derived from the continents considering volcanic dust is composed of quartz whereas grit derived from the continents is composed of feldspar all of these The Great Basin and Mojave deserts of western Due north America exist primarily _________ . because they lie nearly the equator because they lie thousands of kilometers from the ocean considering they lie in the rainshadow of coastal mountains all of these Much of a desert's surface consists of sand, gravel, and rock rubble because _________ . dirt minerals grade slowly in a desert environment air current blows away clay and soil before it can accrue to corking thickness vegetation is thin and cannot forestall erosion of soil all of these Which of the post-obit would y'all least expect to find in a desert? playa lakes rounded, soil-covered hills steep river valleys and gorges dune fields Which of the post-obit is not a current of air eolith? pediment sand dune loess all of these are wind deposits A wide, gently-sloping platform of bedrock that is left behind every bit a mount front is eroded is chosen a(n) ___________ . pediment alluvial fan mesa erg Wind speeds of 117 kilometers per hour or more constitute a _______ moderate to strong breeze moderate to strong gale whole gale to tempest hurricane In temperate zones of the Earth between 30o and 60 o latitude, the prevailing winds come from the ________. north s east west In the effigy above, the letters A through D stand for wind names. Which of the following is false? A and B correspond the "westerlies" A and C stand for "trade winds" C and D stand for "trade winds" none of these statements are false Ripples are more often than not oriented ________ to the current direction parallel 30 degrees 45 degrees perpendicular In a large dust tempest, approximately how much dust can ane cubic kilometer of air comport? 1 ton 10 tons 100 tons m tons Fine-grained dust particles from the eruption of Mr. Pinatubo remained in the atmosphere for how long? 1 - ii months iii - 4 months one -2 years 3 - 4 years White Sands National Monument contains sand dunes fabricated up of _________? quartz gypsum organic sources including pollen and leaner feldspar What is the primary crusade of frosting on the surface of quartz sand grains? impacts with other sand grains abrasion by air currents wearisome dissolution by due none of these Which of the following statements is false? wind is a more constructive erosion amanuensis in wet climates current of air is a more effective erosion agent in dry climates wind is an equally effective erosion agent in wet and dry climates wind does not cause erosion The process by which the ground surface is lowered by current of air erosion is called _______. deflation inflation ablation none of these Which of the post-obit will not accelerate deflation? established vegetation structure motor vehicle tracks plowing How does desert pavement form? by intense chemical weathering past stream erosion by intense mechanical weathering past current of air erosion Yardangs are: sand dunes bundled in long, parallel rows eroded boulder with long, parallel grooves long, parallel ridges eroded by grit none of these Which of the following promote the evolution of sand dunes? strong winds a supply of loose sand dry out climate all of these Sand will accumulate ___________. on the lee side (downwind) side of a boulder on the windward side (upwind) of a boulder on both the lee side and the windward side of a boulder boulders 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 n eastward to west west to east The steeper, downwind side of a sand dune is chosen a _________. sand drift ventifact skid face streamline A cross bed preserved in an eolian sandstone represents _________. the top of a former sand dune the lesser of a old sand dune the upwind side of a former sand dune the downwind side of a former sand dune This sand dune is a _______ dune barchan transverse blowout linear The wind direction which would create this dune is __________. north to south south to north east to west west to east In a barchan dune, the points of the crescent point ______ and the slip confront is the ________ downwind curve of this dune upwind .... concave upwind .... convex downwind .... concave downwind ..... convex Sand dunes backside beaches are typically_______. barchan transverse barchans linear dunes During erosion loess tends to break off __________. in horizontal layers in vertical sheets forth irregular cracks slowly, grain past grain Which of the post-obit is not related to current of air erosion? loess ventifacts deflation blowouts Long sand ridges that are more or less parallel to the prevailing wind are called ______. barchan dunes linear dunes transverse dunes blowouts Through geologic time the interior of Australia has changed from a moist, humid climate to a desert considering plate collisions take congenital mountains almost the coast line which block moisture-bearing winds from the continent's interior Commonwealth of australia has moved northward into an arid, subtropical zone Commonwealth of australia has moved southward out of the function of the more than humid merchandise winds the continent has grown through volcanic action making the interior also far away from moisture-begetting winds Radar imaging from the space shuttle Try has provided show that the Sahara Desert __________. has always been an arid surround was once tropical with many different types of vegetation once had an all-encompassing organisation of river channels which are now dry out has sand dunes in excess of 300 chiliad in height The transformation of semi-arid regions into deserts is called _______. deflation deforestation detoxification desertification What minerals are responsible for the orangish-chocolate-brown colors of weathered surfaces in the desert? quartz alkali feldspar iron oxides all of these Approximately what pct of the globe's deserts are covered with sand? v% twenty% 50% 100% A wadi is a ________ shallow lake playa with salt sediments dry launder flood deposits A mesa is __________ inundation deposit in a small dry wash a flat plateau surrounded by steep cliffs mountain showing horizontal sedimentary layering a pediment with an alluvial fan cover wisebusell.blogspot.com Source: https://www.uh.edu/~jbutler/physical/chap14mult.html Share this post
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