Geology 100 Self-Test 2

Answer the questions below and then click "submit" to send your answers.

  1. What are the subdivisions of the earth and their relative size?

    2. Your answer:

  2. Describe the differences between continental crust and oceanic crust.

    3. Your answer:

  3. Heat flow was found to be equal through continents and the sea floor. Why was this unexpected? What might cause this equality?

    4. Your answer:

  4. Felsic and mafic are terms used by some geologists to describe

    5. Your answer:
    composition of continental and oceanic crust
    behaviors of earthquake waves
    regions in the mantle

  5. The boundary that separates the crust from the mantle is called

    6. Your answer:
    lithosphere
    asthenosphere
    Mohorovicic discontinuity (Moho)
    none of the above

  6. The principle of the continents being in buoyant equilibrium is called

    7. Your answer:
    subsidence
    isostasy
    convection
    rebound

  7. A positive gravity anomaly indicates that

    8. Your answer:
    tectonic forces are holding a region up out of isostatic equilibrium
    the land is sinking
    local mass deficiencies exist in the crust
    all of the above

  8. A positive magnetic anomaly could indicate

    9. Your answer:
    a body of magnetic ore
    the magnetic field strength is higher than the regional average
    the presence of a granitic basement high
    all of the above

  9. Which of the following is not an example of the effects of isostasy?

    10. Your answer:
    deep mountain roots
    magnetic reversals
    the postglacial rise of northeastern North America
    mountain ranges at subduction zones

  10. The S-wave shadow zone is evidence that

    11. Your answer:
    the core is made of iron and nickel
    the inner core is solid
    the outer core is fluid
    the mantle is plastic