Continental Drift and Mantle Convection Insights
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Questions and Answers

What was Arthur Holmes' contribution to the understanding of continental drift?

  • He provided evidence that disproved Wegener's hypothesis.
  • He elaborated on the idea of thermal convection in the mantle. (correct)
  • He proposed that continents were fixed and did not move.
  • He discovered the fossils that linked continents across oceans.
  • How does thermal convection in the Earth's mantle operate?

  • Cool rock rises and hot rock sinks.
  • Rock moves uniformly without rising or sinking.
  • Hot rock rises, spreads out, cools, and then sinks back. (correct)
  • Hot rock rises, cools, and then remains stable.
  • What is the significance of convection cells in relation to continental movement?

  • They prevent the movement of the continents.
  • They stabilize the position of the continents.
  • They have no impact on continental drift.
  • They act like a conveyor belt that can break apart continents. (correct)
  • What key factor contributed to the resurgence of interest in continental drift after Wegener's death?

    <p>Technological advancements providing new evidence.</p> Signup and view all the answers

    What was lacking in Wegener's initial hypothesis about continental drift?

    <p>A clear explanation for how continents could move.</p> Signup and view all the answers

    What term did Wegener use to describe the single landmass that existed around 300 million years ago?

    <p>Pangaea</p> Signup and view all the answers

    What was the primary criticism of Wegener’s Continental Drift Hypothesis by other scientists?

    <p>It proposed an impossible mechanism for movement.</p> Signup and view all the answers

    How did Wegener compare the movement of continents according to his hypothesis?

    <p>To icebreaking ships plowing through ice sheets.</p> Signup and view all the answers

    What forces did Wegener propose were responsible for the movement of continents?

    <p>Centrifugal and tidal forces.</p> Signup and view all the answers

    What conclusion did scientists reach about the strength of centrifugal and tidal forces in relation to continent movement?

    <p>They were too weak to move continents.</p> Signup and view all the answers

    What alternative outcome did one scientist propose if centrifugal forces were strong enough to move continents?

    <p>Earth would stop rotating in less than one year.</p> Signup and view all the answers

    What prediction did Wegener make regarding the deformation of continents if they were plowing through the ocean basins?

    <p>They should be much more deformed than they are.</p> Signup and view all the answers

    In what year did Wegener first publish his book detailing his Continental Drift Hypothesis?

    <p>1915</p> Signup and view all the answers

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