The Emergency Alert System (Eas) Quiz

96 Questions | Total Attempts: 81

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The Emergency Alert System (Eas) Quiz

Questions and Answers
  • 1. 
    Which type of basaltic lava flow has a fairly smooth, unfragmented, ropy surface?
    • A. 

      Poopoopedo

    • B. 

      Pupu

    • C. 

      Poipoipu

    • D. 

      Pahoehoe

    • E. 

      Papaya

  • 2. 
    The carbonate compensation depth is
    • A. 

      The depth where diatoms dissolve and do not accumulate in marine sediments

    • B. 

      The level below which calcite and aragonite accumulate in ocean sediments

    • C. 

      An ocean depth characterized by very low concentrations of dissolved carbon dioxide

    • D. 

      The ocean depth at which carbonate supply rate is matched by carbonate dissolution rate

    • E. 

      The depth where it is profitable to mine carbonates from the ocean floor

  • 3. 
    Waves begin to "feel bottom" when the depth of water is ________.
    • A. 

      Equal to one seventh of the wavelength

    • B. 

      Three times as great as the wavelength

    • C. 

      Twice as great as the wavelength

    • D. 

      Equal to one-half the wavelength

    • E. 

      Equal to the wavelength

  • 4. 
    What type of faulting would be most likely to occur along the mid-Atlantic ridge?
    • A. 

      Thrust faulting

    • B. 

      Reverse faulting

    • C. 

      Normal faulting

    • D. 

      Advective faulting

    • E. 

      Convective faulting

  • 5. 
    The boundary between the troposphere and stratosphere is defined by
    • A. 

      The start of a temperature increase with increasing altitude

    • B. 

      The start of a temperature decrease with increasing altitude

    • C. 

      A big increase in the concentration of nitrogen

    • D. 

      A big increase in the concentration of carbon dioxide

    • E. 

      None of the above

  • 6. 
    How do calcareous oozes on the flanks of mid-ocean ridges form?
    • A. 

      Calcite particles precipitate directly from seawater at all ocean depths and sink to the bottom

    • B. 

      Calcite particles are formed by bottom-dwelling organisms

    • C. 

      Calcite particles settle out from calcite-rich turbidity currents

    • D. 

      Calcite particles are formed by organisms in the aphotic zone and sink to the bottom

    • E. 

      Calcite particles are formed by organisms in the photic zone and sink to the bottom.

  • 7. 
    Coccolithophores are
    • A. 

      Photosynthetic plankton with silica shells

    • B. 

      Photosynthetic plankton with aragonite shells

    • C. 

      Non-photosynthetic zooplankton with chitin exoskeletons

    • D. 

      Non-photosynthetic plankton with calcite shells

    • E. 

      Photosynthetic plankton with calcite shells

  • 8. 
    ________ refers to the tendency for a foundation material to lose its internal cohesion and fail mechanically during earthquake shaking.
    • A. 

      Liquefaction

    • B. 

      Liquefaction

    • C. 

      Motion slip

    • D. 

      Occultation

    • E. 

      Seismoflowage

  • 9. 
    Drainage basins are separated by imaginary lines called
    • A. 

      Aquifiers

    • B. 

      Divides

    • C. 

      Topography

    • D. 

      Aquitards

    • E. 

      None of the above

  • 10. 
    The Aleutian Islands occur at a ________.
    • A. 

      Divergent boundary where shield volcanoes are forming

    • B. 

      Transform boundary where North America has moved towards Alaska

    • C. 

      Convergent, continental margin with uplifted fault blocks, much like those of the Basin and Range Province

    • D. 

      Deep mantle hot spot

    • E. 

      Convergent boundary on a volcanic arc above a northward-subducting Pacific plate

  • 11. 
    The most common Precambrian fossils are layered mounds of calcium carbonate called
    • A. 

      Prokaryotes

    • B. 

      Eukaryotes

    • C. 

      Stromatolites

    • D. 

      Trilobites

    • E. 

      None of the above

  • 12. 
    ________ denotes the exposed, crescent-shaped rupture surface at the head of a slump
    • A. 

      Horst

    • B. 

      Scarp

    • C. 

      Ledge

    • D. 

      Sole

    • E. 

      Laccolith

  • 13. 
    The ________ period was a time of major extinctions, including 75 percent of amphibian families
    • A. 

      Devonian

    • B. 

      Mississippian

    • C. 

      Pennsylvanian

    • D. 

      Permian

    • E. 

      Jurassic

  • 14. 
    The two most common elements in the Earth's crust are ___________
    • A. 

      Calcium and carbon

    • B. 

      Iron and magnesium

    • C. 

      Iron and sulfur

    • D. 

      Chlorine and sodium

    • E. 

      Silicon and oxygen

  • 15. 
    ________ most effectively outline the edges of asthenospheric plates.
    • A. 

      Lines of earthquake epicenters

    • B. 

      Gravitational anomalies

    • C. 

      The locations of deep mantle hot spots

    • D. 

      Lines of active stratovolcanoes

    • E. 

      None of the above

  • 16. 
    Due to a virtual absence of land plants and certain animals, fossil fuels are notably absent in ________ rocks.
    • A. 

      Paleozoic and Mesozoic

    • B. 

      Paleozoic

    • C. 

      Cenozoic

    • D. 

      Mesozoic

    • E. 

      Precambrian

  • 17. 
    In the deep waters (greater than 1000 m) of the ocean concentrations of the vital nutrient nitrogen are:
    • A. 

      Same in the Atlantic and Pacific

    • B. 

      Dependent on levels of deep water photosynthesis

    • C. 

      Lowest in the Atlantic, highest in the Pacific

    • D. 

      Highest in the Atlantic, lowest in the Pacific

    • E. 

      Highly variable in the Atlantic and Pacific depending on the season

  • 18. 
    A geologist observes a river with large bends and meanders  in a 300 meter deep steep walled valley.   The geologist correctly interprets that the
    • A. 

      Land containing the river is atastic

    • B. 

      Land containing the river has subsided

    • C. 

      Sea level has risen

    • D. 

      Land containing the river has been uplifted

    • E. 

      None of the above

  • 19. 
    The Earth's magnetic field originates by ________.
    • A. 

      Magnetic mineral grains in the inner core

    • B. 

      Magnetization of oxygen and nitrogen atoms in the atmospheric ozone layer by solar radiation

    • C. 

      Weak electrical currents associated with hot, rising, mantle plumes

    • D. 

      Weak electrical currents associated with fluid motions in the outer core

    • E. 

      None of the above

  • 20. 
    Variations in solar radiation reaching the earth over 20 to 100 thousand year time scales
    • A. 

      Are explained in part by variations in solar occlusion and parallax

    • B. 

      Are explained in part by variations in the eccentricity, obliquity and precession of the Earth's orbit.

    • C. 

      Are explained in part by isotopic fractionation.

    • D. 

      A and b

    • E. 

      None of the above

  • 21. 
    In correct order from the center outward, Earth includes which units or regions?
    • A. 

      Inner core, outer core, lower mantle, asthenosphere, crust

    • B. 

      Inner core, lithosphere, lower mantle, asthenosphere, crust

    • C. 

      Inner core, outer core, lithosphere, mantle, asthenosphere

    • D. 

      Inner core, outer core, lower mantle, astrosphere, crust

    • E. 

      Inner core, inner mantle, outer core, asthenosphere, crust

  • 22. 
    Linear, magnetic patterns associated with mid-ocean ridges are configured as ________.
    • A. 

      Normal magnetizations along the rift valleys and reverse magnetizations along the ridge

    • B. 

      Concentric circles about a rising plume of hot mantle rocks and magma

    • C. 

      Normal and reversed magnetized strips roughly parallel to the ridge

    • D. 

      Reversed magnetizations along the rift valleys and normal magnetizations along the ridge

    • E. 

      Normal and reversed magnetized strips roughly perpendicular to the ridge axis

  • 23. 
    In an El Nino year, near surface waters off Peru become _______.
    • A. 

      Warmer than normal and nutrient poor

    • B. 

      More benthic

    • C. 

      Colder than normal and nutrient rich

    • D. 

      Colder than normal and nutrient poor

    • E. 

      Warmer than normal and nutrient rich

  • 24. 
    By the close of the Paleozoic, all the continents had fused into the single super continent of ________.
    • A. 

      Europa

    • B. 

      Pangea

    • C. 

      Laurasia

    • D. 

      Appalachia

    • E. 

      Gondwanaland

  • 25. 
    Approximately how much more energy is released in a 6.5 Richter magnitude earthquake than in one with magnitude 5.5?
    • A. 

      2x

    • B. 

      30x

    • C. 

      100x

    • D. 

      1000x

    • E. 

      5x

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