Geology 100 Self-Test 10

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

  1. What role do gasses play in volcanism?

    2. Your answer:

  2. What do pillow structures indicate about the environment of volcanism?

    3. Your answer:

  3. What determines the viscosity of lava?

    4. Your answer:

  4. Why are extrusive igneous rocks fine-grained?

    5. Your answer:

  5. Mount St. Helen’s

    6. Your answer:
    last erupted violently in 1980
    is part of the Cascade Range
    is located in southern Washington
    all of the above

  6. Volcanic eruptions can effect the climate because

    7. Your answer:
    they heat the atmosphere
    volcanic dust and gas can reduce the amount of solar radiation that penetrates the atmosphere
    they change the elevation of the land
    all of the above

  7. Mafic rocks contain about _____% silica.

    8. Your answer:
    10
    25
    50
    80

  8. Felsic (silicic) rocks contain about _____% silica.

    9. Your answer:
    10
    25
    50
    70

  9. Which is not an extrusive igneous rock?

    10. Your answer:
    granite
    rhyolite
    basalt
    andesite

  10. A typical example of a shield volcano is

    11. Your answer:
    Mount St Helens
    Kilauea in Hawaii
    El Chichon
    Mount Vesuvius