Clastic Sedimentology And Petrography-jan 2018-quiz II-
30 Questions
| Total Attempts: 96
.
Questions and Answers
- 1.At high wind velocities silt- and clay-sized particles are carried as bed load.
- A.
True
- B.
False
- 2.A desert is a continental area that receives little precipitation.
- A.
True
- B.
False
- 3.Draa is an area where sand has accumulated as a result of aeolian processes.
- A.
True
- B.
False
- 4.Sand grains that have undergone a sustained period of aeolian transport therefore become angular, or even very angular.
- A.
True
- B.
False
- 5.Effective and selective separation of grains during transport means that aeolian deposits are typically well-sorted
- A.
True
- B.
False
- 6.This winnowing effect, the selective removal of finer grains from the sediment in a flow, also occurs in water flows, but is more effective in the higher density and viscosity medium of water.
- A.
True
- B.
False
- 7.Most modern and ancient wind-deposited sands are quartz arenites.
- A.
True
- B.
False
- 8.Aeolian carbonate deposits are lessstable features than dunes made of quartz sand.
- A.
True
- B.
False
- 9.Ripple heights (bottom of the trough to the top of a crest) range from less than a meter to more than ten of meter.
- A.
True
- B.
False
- 10.Where a crest becomes well-developed grains may avalanche down into the adjacent trough forming plannar-lamination.
- A.
True
- B.
False
- 11.Sand dunes built up by aeolian action can form adjacent to beaches in any climatic setting.
- A.
True
- B.
False
- 12.Oxidising conditions in deserts preclude the preservation of much fossil material, and sediments are typically red–yellow colours.
- A.
True
- B.
False
- 13.Debris flow material form any size from clay to large boulders may be present
- A.
True
- B.
False
- 14.Turbidity current are more dense mixtures than debris flows and with a relatively low Reynolds number are usually turbulent flows.
- A.
True
- B.
False
- 15.Turbidity current flow down slopes or over a horizontal surface provided that the thickness of the flow is greater downflow than it is upflow.
- A.
True
- B.
False
- 16.Turbidity currents, and hence turbidites, can occur in water anywhere that there is a supply of sediment and a slope
- A.
True
- B.
False
- 17.The last material to be deposited from a turbidity current will be the coarsest as this will fall out of suspension first.
- A.
True
- B.
False
- 18.High-density turbidity currents have a bulk density of at least 1.1 g cm-3 .
- A.
True
- B.
False
- 19.Avalanches are mechanisms of mass transport down a steep slope, which are also known as grain flows.
- A.
True
- B.
False
- 20.Grain flow mechanism is most effective in poorly sorted material falling under gravity down a steep slope such as the slip face of an aeolian dune.
- A.
True
- B.
False
- 21.Small-scale erosional features on a bed surface are referred to as sole marks.
- A.
True
- B.
False
- 22.Flute casts are symmetric in cross-section with one steep edge opposite a tapered edge.
- A.
True
- B.
False
- 23.Rill marks are small-scale dendritic channels formed by the erosion of non-cohesive sand.
- A.
True
- B.
False
- 24.Desiccation cracks are often filled with finer sediment.
- A.
True
- B.
False
- 25.Raindrop impressions are formed by rain falling onto a non-cohesive sediment surface.
- A.
True
- B.
False
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