Active Dunes Are Continuously Moving Downwind Advancing at All Times True or False Written By Tench Comentend Sunday, 23 October 2022 Add Comment Edit Geologic processes powered by the wind are called __________ processes. barchan coriolis eolian yardang Turbulence of air increases in proportion to the ___________ of the air flow. volume velocity acceleration distance Due 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. east ... east east ... west west ... east west ... west The Earth rotates from _______ to _______ . west ... east east ... west north .... south south ... north Sand grains saltating in air can jump higher than sand grains saltating in water because ___________ . water is less dense 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 important source of dust? volcanic dust 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 west. During deposition of the sand, the prevailing winds were probably from the __________ . east west north south Large dune fields, or seas of sands, are called _______ . draas barchans regs ergs Deserts with a pebble surface are called _________ . draas barchans regs ergs Which of the following are not related to wind erosion? loess ventifact deflation blowout The loess deposited in the upper Mississippi Valley was derived primarily from ________ . volcanic dust desert regions lying to the west glacial deposits coastal sand dunes Why does volcanic dust tend to travel further than wind-blown dust derived from the continents? because volcanic dust is erupted high into the atmosphere because volcanic dust is less dense than dust derived from the continents because volcanic dust is composed of quartz whereas dust derived from the continents is composed of feldspar all of these The Great Basin and Mojave deserts of western North America exist primarily _________ . because they lie near the equator because they lie thousands of kilometers from the ocean because 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 _________ . clay minerals form slowly in a desert environment wind blows away clay and soil before it can accumulate to great thickness vegetation is sparse and cannot prevent erosion of soil all of these Which of the following would you least expect to find in a desert? playa lakes rounded, soil-covered hills steep river valleys and gorges dune fields Which of the following is not a wind deposit? pediment sand dune loess all of these are wind deposits A broad, gently-sloping platform of bedrock that is left behind as a mountain front is eroded is called 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 storm hurricane In temperate zones of the Earth between 30o and 60 o latitude, the prevailing winds come from the ________. north south east west In 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 false Ripples are generally oriented ________ to the current direction parallel 30 degrees 45 degrees perpendicular In a large dust storm, approximately how much dust can 1 cubic kilometer of air carry? 1 ton 10 tons 100 tons 1000 tons Fine-grained dust particles from the eruption of Mr. Pinatubo remained in the atmosphere for how long? 1 - 2 months 3 - 4 months 1 -2 years 3 - 4 years White Sands National Monument contains sand dunes made up of _________? quartz gypsum organic sources including pollen and bacteria feldspar What is the primary cause of frosting on the surface of quartz sand grains? impacts with other sand grains abrasion by air currents slow dissolution by due none of these Which of the following statements is false? wind is a more effective erosion agent in wet climates wind 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 wind erosion is called _______. deflation inflation ablation none of these Which of the following will not accelerate deflation? established vegetation construction motor vehicle tracks plowing How does desert pavement form? by intense chemical weathering by stream erosion by intense mechanical weathering by wind erosion Yardangs are: sand dunes arranged in long, parallel rows eroded bedrock with long, parallel grooves long, parallel ridges eroded by dust none of these Which of the following promote the development of sand dunes? strong winds a supply of loose sand dry 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 north east to west west to east The steeper, downwind side of a sand dune is called a _________. sand drift ventifact slip face streamline A cross bed preserved in an eolian sandstone represents _________. the top of a former sand dune the bottom of a former 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 face is the ________ downwind curve of this dune upwind .... concave upwind .... convex downwind .... concave downwind ..... convex Sand dunes behind beaches are typically_______. barchan transverse barchans linear dunes During erosion loess tends to break off __________. in horizontal layers in vertical sheets along irregular cracks slowly, grain by grain Which of the following is not related to wind 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 because plate collisions have built mountains near the coast line which block moisture-bearing winds from the continent's interior Australia has moved northward into an arid, subtropical zone Australia has moved southward out of the part of the more humid trade winds the continent has grown through volcanic activity making the interior too far away from moisture-bearing winds Radar imaging from the space shuttle Endeavor has provided evidence that the Sahara Desert __________. has always been an arid environment was once tropical with many different types of vegetation once had an extensive system of river channels which are now dry has sand dunes in excess of 300 m in height The transformation of semi-arid regions into deserts is called _______. deflation deforestation detoxification desertification What minerals are responsible for the orange-brown colors of weathered surfaces in the desert? quartz alkali feldspar iron oxides all of these Approximately what percentage of the world's deserts are covered with sand? 5% 20% 50% 100% A wadi is a ________ shallow lake playa with salt sediments dry wash flood deposits A mesa is __________ flood 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 spoonerpropis1989.blogspot.com Source: https://uh.edu/~jbutler/physical/chap14mult.html Share this post
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