Sand Dune Evernote Notes Quiz

20 Questions | Total Attempts: 184

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Sand Dune Evernote Notes Quiz

Sand Dune Evernote Notes Quiz


Questions and Answers
  • 1. 
    Sand dune habitats form by____________
    • A. 

      Sand dune habitats form by wind transport of sand and the growth of stabilizing vegetation.

    • B. 

      Sand dune habitats form by wind transport of sand captured by detritus along the strand line.

    • C. 

      Sand dune habitats form by onshore winds transporting sand from the nearshore sandbar.

    • D. 

      Sand dune habitats form by onshore winds transporting sand from the berm.

  • 2. 
    Sand moves by a. _____________ this happens when ________________________
    • A. 

      A. saltation b. sand lifted by wind energy bounces along a loose sand surface and sets other grains in motion by its impact.

    • B. 

      A. saltation b. sand moved by wind energy creeps along the shore face and sets other grains in motion by its impact.

    • C. 

      A. littoral drift b. sand lifted by wind energy bounces along a loose sand surface and sets other grains in motion by its impact.

    • D. 

      A. impact threshold b. sand lifted by wind energy bounces along a loose sand surface.

  • 3. 
    The wind velocity necessary to initiate sand movement is about __________mph
    • A. 

      The wind velocity necessary to initiate sand movement is about 10 mph

    • B. 

      The wind velocity necessary to initiate sand movement is about 15 mph

    • C. 

      The wind velocity necessary to initiate sand movement is about 15-25 mph

    • D. 

      The wind velocity necessary to initiate sand movement is about 35 mph

  • 4. 
    Dunes are made of finer sands because______________
    • A. 

      Dunes are made of finer sands because only the smallest grains of beach sand usually move.

    • B. 

      Dunes are made of finer sands because only silt grains can be moved.

    • C. 

      Dunes are made of finer sands because only finer sand is found at the berm.

    • D. 

      Dunes are made of finer sands because finer sands form mounds in which dune plants can take root.

  • 5. 
    Sand dune tidal litter includes:
    • A. 

      Sand dune tidal litter includes: decomposing grasses and organism remains.

    • B. 

      Sand dune tidal litter includes: cordgrass (spartina) and organism remains.

    • C. 

      Sand dune tidal litter includes: decomposing grasses, salt spray and organism remains.

    • D. 

      Sand dune tidal litter includes: decomposing grasses and ghost crab remains.

  • 6. 
    Vegetation at the high tide line or in a dune increases sand accumulation by____________
    • A. 

      Vegetation at the high tide line or in a dune increases sand accumulation by reducing the wind velocity.

    • B. 

      Vegetation at the high tide line or in a dune increases sand accumulation by increasing the wind velocity.

    • C. 

      Vegetation at the high tide line or in a dune increases sand accumulation by reducing wave turbulence.

    • D. 

      Vegetation at the high tide line or in a dune increases sand accumulation by reducing tide turbulence.

  • 7. 
    1. What two things does the deep root system of American beach grass and sea oats help these plants avoid? a. ________________________   b.___________________________
    • A. 

      What two things does the deep root system of American beach grass and sea oats help these plants avoid? a. surface heat b. evaporation

    • B. 

      What two things does the deep root system of American beach grass and sea oats help these plants avoid? a. salt spray b. wave turbulence

    • C. 

      What two things does the deep root system of American beach grass and sea oats help these plants avoid? a. wind turbulence b. tidal changes

    • D. 

      What two things does the deep root system of American beach grass and sea oats help these plants avoid? a.surface heat b. salt spray

  • 8. 
    What provides the main source of nutrients on frontal dunes?
    • A. 

      Salt spray provides the main source of nutrients on frontal dunes.

    • B. 

      Detritus provides the main source of nutrients on frontal dunes.

    • C. 

      Sea oats provides the main source of nutrients on frontal dunes.

    • D. 

      Oxygen provides the main source of nutrients on frontal dunes.

  • 9. 
    Water supply is scarce on the frontal dune. How do dune plants hydrate?
    • A. 

      Plants hydrate by capturing moisture from rainfall and using their deep root system to reach the water table below the dunes.

    • B. 

      Plants hydrate from the tides at high tide and use their deep root system to reach the low tide line below the dunes.

    • C. 

      Plants hydrate by using their deep root system to reach deep into the dunes.

    • D. 

      Plants hydrate by capturing moisture from detritus at the high tide strand line.

  • 10. 
    Behind the frontal dune, the salt spray causes tree and shrub branches to grow_________
    • A. 

      Behind the frontal dune, the salt spray causes tree and shrub branches to grow stunted and appear sculpted.

    • B. 

      Behind the frontal dune, the salt spray causes tree and shrub not to grow.

    • C. 

      Behind the frontal dune, the salt spray causes tree and shrub branches to grow tall and wide.

    • D. 

      Behind the frontal dune, the salt spray causes tree and shrub branches to grow long and thin.

  • 11. 
    What is surface creep?
    • A. 

      Surface creep occurs when saltating grains of sand strike heavier grains larger than one millimeter in diameter causing the heavier grains a slight forward movement along the surface.

    • B. 

      Surface creep occurs when saltating grains of sand strike finer grains smaller than one millimeter in diameter causing the finer grains a slight forward movement along the surface.

    • C. 

      Surface creep occurs when saltating grains of sand strike heavier grains larger than one millimeter in diameter causing the finer grains a slight forward movement along the surface.

    • D. 

      Surface creep occurs when saltating grains of sand strike heavier grains larger than one millimeter in diameter causing the heavier grains to suspend in the air from their movement along the surface.

  • 12. 
    What is the "fluid threshold" of saltation?
    • A. 

      Fluid threshold is the wind speed necessary for sand to start saltating under the direct pressure of the wind.

    • B. 

      Fluid threshold is the wind speed necessary to maintain saltation once it has begun

    • C. 

      Fluid threshold is how all the surfaces respond to each other as they move.

    • D. 

      Fluid threshold is wind speeds above 20 mph that occur above the windy side of a dune.

  • 13. 
    What makes sand accumulate into piles rather than spread out evenly over an area?
    • A. 

      Sand tends to accumulate any place where there is a sufficient reduction of wind energy in the direction that sand drifts in and any obstacle, such as a rock outcrop or a stand of vegetation, forces sand accumulation by lowering the wind speed.

    • B. 

      Sand tends to accumulate any place where there is a abundant wind velocity in the direction that sand drifts in and any obstacle, such as a rock outcrop or a stand of vegetation, forces sand accumulation by lowering the wind speed.

    • C. 

      Sand tends to accumulate any place where there is a sufficient reduction of sand in the sand drifts in and any obstacle, such as a rock outcrop or a stand of vegetation, forces sand accumulation by sustaining the wind speed.

    • D. 

      Sand tends to accumulate any place where there is a sufficient reduction of sand in the sand drifts in and any obstacle, such as a rock outcrop or a stand of vegetation, forces sand accumulation by lowering the wind speed.

  • 14. 
    Identify the sides of a dune.  #1 ____________  and  #2 _____________
    • A. 

      #1 sand slumps down the sand shadow slip face # 2 sand moves up this slope

    • B. 

      #1 sand moves up this slope # 2 sand slumps down the sand shadow slip face

    • C. 

      #1 sand is saltating and # 2 sand is in sand shadow

    • D. 

      #1 sand is suspended and # 2 sand is in the sand shadow slip face

  • 15. 
    Identify the sand movement in the diagram in the order of these numbers: #1 _______________, #2 ______________, #3 ______________
    • A. 

      #1 suspension, #2 saltation, #3 creep

    • B. 

      #1 saltation, #2 suspension, #3 creep

    • C. 

      #1 suspension, #2 saltation, #3 impact threshold

    • D. 

      #1 fluid threshold, #2 saltation, #3 impact threshold

  • 16. 
    Identify each sediment particle size:  #1 ____________, #2 ______________, #3 ______________
    • A. 

      #1 sand, #2 silt, #3 clay

    • B. 

      #1 course sand, #2 fine sand , #3 silt

    • C. 

      #1 rock, #2 sand, #3 silt

    • D. 

      #1 mud, #2 silt, #3 clay

  • 17. 
    Sand grains average about _______________ times the weight of the atmosphere, not all winds move sand.
    • A. 

      Two thousand

    • B. 

      One thousand

    • C. 

      5 thousand

    • D. 

      600 hundred

  • 18. 
    Saltation of sand along the surface accounts for about _________ of all sand movement by wind.
    • A. 

      75%

    • B. 

      25%

    • C. 

      50%

    • D. 

      100%

  • 19. 
    Any obstacle such as an rock outcrop or a stand of vegetation, can force sand accumulation by___________________
    • A. 

      Lowering wind speed causing the sand to mound which creates a "sand shadow" to the leeward (leeward - away from the wind) side of the obstacle.

    • B. 

      Raising the wind speeds (on the windward side) causing the sand to mound.

    • C. 

      Raising the wind speed and forming a depression or gentle dip in a flat surface that can fill with sand.

    • D. 

      Moderating the wind speed for sand to mound.

  • 20. 
    What is the relationship between heavier grains of sand and the "creep" movement of sand?
    • A. 

      Saltating sand grains strike heavy grains of sand on the surface. These saltating grains don't have enough energy to knock the heavier grains into the air. The saltating grains cause the heavy grains to move slightly forward or "creep" along the surface.

    • B. 

      Saltating sand grains strike fine grains of sand on the sand surface. These saltating grains have enough energy to knock the fine grains into the air. These fine saltating grains cause the heavy grains to move slightly forward or "creep" along the surface.

    • C. 

      Saltating heavy grains of sand "creep" along the the surface. These heavy saltating grains have enough energy to knock the heavier grains forward or along the surface.

    • D. 

      Storm winds carry heavy grains of sand along the surface. Heavy grains saltate during storms. They move slightly forward or "creep" during a storm.

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