Clastic Sedimentology And Petrography-quiz 1- Jan 2018

30 Questions | Total Attempts: 278

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Clastic Sedimentology And Petrography-quiz 1- Jan 2018 - Quiz

Questions and Answers
  • 1. 
    At high wind velocities silt- and clay-sized particles are carried as bed load.
    • A. 

      True

    • B. 

      False

  • 2. 
    Grain roundness is therefore a characteristic that can easily be seen in hand specimen using a hand lens, or will be evident under the microscope if a thin-section is cut of an aeolian sandstone
    • A. 

      True

    • B. 

      False

  • 3. 
    A lagoon is the marine-influenced portion of a drowned valley.
    • A. 

      True

    • B. 

      False

  • 4. 
    Sediment supply to the estuary is from river sources only and the processes that transport and deposit this sediment are a combination of river and wave and/or tidal processes.
    • A. 

      True

    • B. 

      False

  • 5. 
    Difference between estuary and delta is that a delta retrograde inwards into the lake or sea. A estuary all the sedimentation occurs in the drowned valley
    • A. 

      True

    • B. 

      False

  • 6. 
    An estuary developed in an area with a large tidal range and weak wave energy will typically have three divisions. 
    • A. 

      True

    • B. 

      False

  • 7. 
    Bay  head delta: Is the zone where fluvial processes are dominant
    • A. 

      True

    • B. 

      False

  • 8. 
    An estuary is a body of salt water separated from the deeper sea by a shallow or exposed barrier beach, sandbank, coral reef, or similar feature. 
    • A. 

      True

    • B. 

      False

  • 9. 
    The Bernoulli effect can best be explained by considering flow of a fluid (air, water or any fluid medium) in a tube that is narrower at one end than the other
    • A. 

      True

    • B. 

      False

  • 10. 
    In cross-section wave ripples are generally symmetrical in profile, laminae within each ripple dip in both directions and are overlapping.
    • A. 

      True

    • B. 

      False

  • 11. 
    Wave ripples are formed only in relatively shallow water in the absence of strong currents, whereas current ripples may form as a result of water flow in any depth in any subaqueous environment.
    • A. 

      True

    • B. 

      False

  • 12. 
    Lavas are found close to the site of the eruption, but ash may be spread tens, hundreds or even thousands of kilometres away.
    • A. 

      True

    • B. 

      False

  • 13. 
    Basaltic magmas tend to form volcanoes that produce small volumes of lava, but large amounts of volcanic ash
    • A. 

      True

    • B. 

      False

  • 14. 
    Volcanoes with more silicic magma are much more explosive, with large amounts of the molten rock being ejected from the volcano as particulate matter
    • A. 

      True

    • B. 

      False

  • 15. 
    •Calcium carbonate (CaCO3) is the principal compound in limestones.
    • A. 

      True

    • B. 

      False

  • 16. 
    There is a chemical difference between calcite and aragonite.
    • A. 

      True

    • B. 

      False

  • 17. 
    Cherts are fine-grained siliceous sedimentary rocks made up of silt-sized interlocking quartz crystals (microquartz) and chalcedony, a form of silica which is made up of radiating fibres a few tens to hundreds of microns long.
    • A. 

      True

    • B. 

      False

  • 18. 
    Sediments and sedimentary rocks with a high proportion of organic matter are termed carbonates because they are rich in carbon.
    • A. 

      True

    • B. 

      False

  • 19. 
    Fusain: bright, shiny black coal that usually breaks cubically and mostly consists of woody tissue.
    • A. 

      True

    • B. 

      False

  • 20. 
    Volcaniclastic sediments These are the products of volcanic eruptions or the result of the breakdown of volcanic rocks.
    • A. 

      True

    • B. 

      False

  • 21. 
    If all the clasts are of the same material (all of granite, for example), the conglomerate is considered to be polymict
    • A. 

      True

    • B. 

      False

  • 22. 
    Siltis a textural term to define the finest grade of clastic sedimentary particles, those less than 4 microns in diameter.
    • A. 

      True

    • B. 

      False

  • 23. 
    When clay- and silt-sized particles are mixed in unknown proportions as the main constituents in unconsolidated sediment we would call this material shale.
    • A. 

      True

    • B. 

      False

  • 24. 
    Feldspar is the most common mineral seen in silt deposits
    • A. 

      True

    • B. 

      False

  • 25. 
    Montmorillonite minerals can not absorb water within their structure.
    • A. 

      True

    • B. 

      False

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