Chapter 11

The Lithosphere and the Tectonic System

CHAPTER QUIZ

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Multiple Choice Questions

  1. Which of the following statements about the asthenosphere is not correct?
    it is in a liquid state
    it lies below the lithosphere
    it is a soft layer in the mantle
    it contains ultramafic rock

  2. Which of the following is an era of the geologic time scale?
    Pliocene
    Jurassic
    Cenozoic
    Carboniferous

  3. The axial rift of the midoceanic ridge is:
    a line along which seafloor spreading occurs
    a zone of rising magma of mafic composition
    both (a) and (b
    neither (a) nor (b

  4. Along transform plate boundaries, the plates move:
    toward one another
    horizontally past one another
    away from one another
    vertically past one another

  5. Approximately how long ago is the supercontinent of Pangea thought to have begun breaking apart?
    1 billion years ago
    500 million years ago
    250 million years ago
    50 million years ago

True/False Questions

  1. Oldest rocks found on earth are more than 5 billion years old.
    true
    false

  2. New lithosphere is formed along converging plate boundaries.
    true
    false

  3. The Himalayan Mountains near the northern border of India were formed during a continental suture.
    true
    false

Short Answer Questions

  1. What are the two major chains of mountain arcs or alpine belts found on the earth's surface?

  2. There are two different types of lithospheric plates. What are they and how do they differ?

  3. What is the basis for radiometric dating?

Short Essay Questions (1 - 2 paragraphs)

  1. Discuss the following statement: the present pattern of plates and their motions explains the location of many geologic surface phenomena such as major relief features, volcanoes and earthquakes, and rock age.

  2. Briefly describe the origin of the accreted terranes of western North America.

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