Aeolien geomorphology 0.0 / 5 ? GeographyWindDustSedimentDunesTransportUniversityNone Created by: Annal22Created on: 13-05-17 13:55 Sediment is lifted into the air column, before it is pulled back down to the ground by gravity. Saltation 1 of 39 Makes sediment more cohesive, increasing the threshold for wind to move it. moisture 2 of 39 Wind is deflected from sediment by this, so it is shielded and will not move as easily. vegetation 3 of 39 A pattern where wind moves sediment grains depending on their size. streamer 4 of 39 Vegetation doesn't have as much importance as sediment availability and wind regime in determining sed. transport, so is a ............ factor. modifying 5 of 39 When sand is deposited down the lee slope by gravity. Avalanching 6 of 39 The steepest angle at which a pile of unconsolidated sediment is stable is known as the angle of .............. . repose 7 of 39 The steep avalanche face on a barchan dune. lee 8 of 39 The shallower sloping side of a barchan dune. stoss 9 of 39 In a barchan dune, the long extended parts which move with wind direction are the .......... . horns 10 of 39 Which type of dune comprises joined up barchans? barchanoid 11 of 39 Which type of dune features vegetated horns often? parabolic 12 of 39 which type of dune forms under a bimodal wind regime? linear 13 of 39 A star dune forms under which type of wind regime? multidirectional 14 of 39 Which type of dune forms around vegetation? nebkha 15 of 39 Dunes move faster when they are ........ . smaller 16 of 39 What type of dune is made up of two dunes of the same type? compound 17 of 39 what type of dune is made up of two dunes of different types? complex 18 of 39 A system of large, sparsely distributed sand dunes with minimum sand beteween them is known as a ........... . draa 19 of 39 When two dunes come together they ..... . merge 20 of 39 When a compound dune breaks into dune consistuents, it undergoes ................... . shedding 21 of 39 A factor which can affect dune field stability, because of trampling animals. grazing 22 of 39 The factor which is used to look at the mobility of sediment in the Lancaster Index. moisture 23 of 39 As moisture in the air increases, sediment transport ............ . decreases 24 of 39 The effect of a disturbance event can lag behind it, because of the current and historical state of the system. hysteresis 25 of 39 The time difference between a disturbance and an observable geomorphic change is the ............ time. reaction 26 of 39 The relaxation time is the time taken for the system to reach a new ..................... . equilibrium 27 of 39 A closed desert depression, similar to a blowout. pan 28 of 39 The buildup of sediment next to a blowout. lunette 29 of 39 A wind-abraded, streamlined sand structure which looks similar to a shark fin. yardang 30 of 39 Sediment movement downslope because of gravity. creep 31 of 39 Suspended sediment can fall with .............. . precipitation 32 of 39 A dust devil is basically a miniature .........., but with suspended sediment . tornado 33 of 39 Dust in the atmosphere could ........... temperatures. reduce 34 of 39 CCN stands for cloud condensation ............ . nuclei 35 of 39 What element, present in dust, can fertilize global oceans? iron 36 of 39 A wind-blown silt deposit which can fertilize oceans - the largest example is in China. loess 37 of 39 What is the name of the dustiest place on Earth, a lake located in Africa, surrounded by mountains? Mega Chad 38 of 39 An intense sand storm generally occuring after thunderstorms. haboob 39 of 39
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