SIO15 2024: Topic 4


The Layered Earth, Continental Drift and Plate Tectonics


handout notes
LAST MODIFIED: 12 January 2022: definition of magnetic north specified
POSTED: 10 June 2020
  • Additional Resources

  • study guide to book chapter 3
    study guide to book chapter 4
    lecture slides #1 (available AFTER the lecture!)
    not-for-credit online quiz for practice testing (do not request edit access!)
  • Five Random Review Questions (not a complete review!)

  • 1) Which of these does NOT describe the asthenosphere?
    1. weak and ductile
    2. warm and soft
    3. below the lithosphere
    4. above the lithosphere
    2) Which two forces hold a floating body in isostatic equilibrium?
    1. gravity and friction
    2. friction and stress
    3. gravity and buoyancy
    4. buoyancy and potential
    3) At the end of an ice age, the lithosphere sinks after ice sheets have melted.
    1. true
    2. false
    4) Earth's magnetic field is maintained by what process?
    1. mantle convection
    2. a bar magnet at the Earth's center
    3. currents in the liquid outer core
    4. convection in the solid inner core
    5) About how old is the oldest oceanic lithosphere on Earth?
    1. 2000 years
    2. 2 million years
    3. 20 million years
    4. 200 million years
    5. 2 billion years
    6) Subduction zones are found along which plate boundary?
    1. continent-continent convergent
    2. ocean-continent convergent
    3. ocean-ocean convergent
    4. all of the above
    5. b) and c)


    Answers: 1d; 2c; 3b; 4c; 5d; 6e