Geology 100 Self-Test 3

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

  1. Discuss the appearance, structure, and origin of abyssal plains.

    2. Your answer:

  2. What is the main difference between active and passive continental margins?

    3. Your answer:

  3. Describe the two main types of sea floor sediments.

    4. Your answer:

  4. How does the age of sea floor rocks compare to the age of continental rocks?

    5. Your answer:

  5. Most ocean water probably came from

    6. Your answer:
    degassing of the earth’s interior
    outer space
    the effects of plant respiration

  6. Which is true of the continental crust?

    7. Your answer:
    it is a shallow submarine platform at the edge of a continent
    it slopes very gently seaward
    it can vary in width
    all of the above

  7. Which is characteristic of mid-oceanic ridges?

    8. Your answer:
    shallow-focus earthquakes
    high heat flow
    basalt eruptions
    all of the above

  8. Pelagic sediment could be composed of

    9. Your answer:
    fine-grained clay
    skeletons of microscopic organisms
    volcanic ash
    all of the above

  9. What part of the continental margin marks the true edge of the continent?

    10. Your answer:
    continental shelf
    continental slope
    continental rise
    abyssal plain

  10. Distinctive rock sequences of basalt and marine sedimentary rock that may be slices of ocean floor are

    11. Your answer:
    guyots
    ophiolites
    seamounts
    fracture zones