Earth Science Exam #2 The Ocean

55 Questions | Total Attempts: 92

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Earth Science Quizzes & Trivia

Test on Ocean Sediments, Ocean Floor, El Nino and La Nina


Questions and Answers
  • 1. 
    The element found in some sediments which suggest that a meteorite or asteroid impact occurred nearby is:
    • A. 

      A) uranium.

    • B. 

      B) iridium.

    • C. 

      C) manganese.

    • D. 

      D) strontium. D) strontium.

  • 2. 
    "Black smokers" are associated with ________.
    • A. 

      A) oceanic ridges

    • B. 

      B) hot water

    • C. 

      C) mineral-rich waters

    • D. 

      D) all of these

  • 3. 
    The oceans cover approximately ________ percent of Earth's surface.  
    • A. 

      A) 70

    • B. 

      B) 60

    • C. 

      C) 50

    • D. 

      D) 40

  • 4. 
    Which one of the following concerning mid-ocean ridges is false?
    • A. 

      A) are sites for submarine eruptions of basaltic lava A) are sites for submarine eruptions of basaltic lava

    • B. 

      B) are where young lithosphere is added to the edges of spreading, oceanic plates

    • C. 

      C) terrigenous sediment coverings are very thin or absent

    • D. 

      D) sediments include thick siliceous ooze deposits and sandy turbidite beds

  • 5. 
    Which of the following contains calcium carbonate (CaCO3)?
    • A. 

      A) phosphorites

    • B. 

      B) diatoms

    • C. 

      C) radiolarians

    • D. 

      D) glauconite

    • E. 

      E) foraminiferans

  • 6. 
    The most likely place to find abundant manganese nodules is on the:
    • A. 

      A) abyssal plain far from a continent.

    • B. 

      B) continental rise.

    • C. 

      C) crest of a mid-ocean ridge.

    • D. 

      D) continental shelf.

    • E. 

      E) All of the above locations contain manganese nodules.

  • 7. 
    Minerals that crystallize directly from seawater are examples of ________.
    • A. 

      A) hydrogenous sediment

    • B. 

      B) biogenous sediment

    • C. 

      C) terrigenous sediment

    • D. 

      D) both terrigenous and biogenous sediment

  • 8. 
    Submarine canyons form the deepest parts of the ocean basins.
    • A. 

      True

    • B. 

      False

  • 9. 
    Manganese nodules do not accumulate below 4500 meters depth because the manganese minerals are highly soluble in seawater below that depth.
    • A. 

      True

    • B. 

      False

  • 10. 
    Compared to the Southern Hemisphere, a higher percentage of the Northern Hemisphere is water covered.
    • A. 

      True

    • B. 

      False

  • 11. 
    The continental rise lies at the bottom of the continental slope.
    • A. 

      True

    • B. 

      False

  • 12. 
    Sand, silt, and clays deposited on the ocean floor are described as terrigenous sediments
    • A. 

      True

    • B. 

      False

  • 13. 
    A pelagic clay contains lots of material that settles to the seafloor through the water column and are:
    • A. 

      A) more than 30% biogenous material.

    • B. 

      B) more than 30% hydrogenous material

    • C. 

      C) more than 30% neritic material

    • D. 

      D) less than 30% biogenous material.

    • E. 

      E) less than 30% neritic material.

  • 14. 
    The crests of mid-oceanic ridges ________.
    • A. 

      A) lie at depths exceeding 6 kilometers

    • B. 

      B) are geologically old features

    • C. 

      C) are heavily mantled with sediment

    • D. 

      D) contain active rift zones

  • 15. 
    Which of the following is associated with ocean ridges?
    • A. 

      A) rift zones

    • B. 

      B) mountainous topography

    • C. 

      C) volcanic structures

    • D. 

      D) all of these

  • 16. 
    Which of the following is not an important control on oceanic sediment accumulation?
    • A. 

      A) degree of preservation

    • B. 

      B) rate of deposition

    • C. 

      C) input from other sediment types

    • D. 

      D) dilution

    • E. 

      E) All of the above factors are important.

  • 17. 
    Concerning the distribution of land and water, which of the following statements is true?
    • A. 

      A) the Southern Hemisphere has much more water surface than the Northern Hemisphere

    • B. 

      B) the Northern Hemisphere has much more water surface than the Southern Hemisphere

    • C. 

      C) the percentage of land and water is about the same in both the Northern and Southern Hemispheres

    • D. 

      D) none of the above are true

  • 18. 
    Which one of the following salts is most abundant in seawater?
    • A. 

      A) sodium chloride

    • B. 

      B) sodium bicarbonate

    • C. 

      C) potassium bromide

    • D. 

      D) magnesium chloride

  • 19. 
    Submarine canyons found on the continental slope and are believed to have been created ________.
    • A. 

      A) by rivers during the ice age

    • B. 

      B) because of a plate plunging into the mantle

    • C. 

      C) by faulting

    • D. 

      D) none of these

  • 20. 
    Submerged, flat-topped seamounts are known as guyots.
    • A. 

      True

    • B. 

      False

  • 21. 
    Seafloor hot springs occur mainly in oceanic, abyssal plains.
    • A. 

      True

    • B. 

      False

  • 22. 
    The Atlantic and Pacific basins have oceanic ridges; the Indian Ocean has no oceanic ridge
    • A. 

      True

    • B. 

      False

  • 23. 
    Turbidites and siliceous oozes are both biogenous sediments.
    • A. 

      True

    • B. 

      False

  • 24. 
    The surface waters in regions where evaporation rates are high, such as the Red Sea, have higher than average salinities
    • A. 

      True

    • B. 

      False

  • 25. 
    The BEST definition of the outer edge of the continental shelf is that point where ________.
    • A. 

      A) a rapid steepening of the gradient occurs

    • B. 

      B) the water depth reaches 100 fathoms

    • C. 

      C) it meets an oceanic ridge

    • D. 

      D) the gradient becomes very gentle

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