Podcast
Questions and Answers
What was Arthur Holmes' contribution to the understanding of continental drift?
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?
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?
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?
What key factor contributed to the resurgence of interest in continental drift after Wegener's death?
What was lacking in Wegener's initial hypothesis about continental drift?
What was lacking in Wegener's initial hypothesis about continental drift?
What term did Wegener use to describe the single landmass that existed around 300 million years ago?
What term did Wegener use to describe the single landmass that existed around 300 million years ago?
What was the primary criticism of Wegener’s Continental Drift Hypothesis by other scientists?
What was the primary criticism of Wegener’s Continental Drift Hypothesis by other scientists?
How did Wegener compare the movement of continents according to his hypothesis?
How did Wegener compare the movement of continents according to his hypothesis?
What forces did Wegener propose were responsible for the movement of continents?
What forces did Wegener propose were responsible for the movement of continents?
What conclusion did scientists reach about the strength of centrifugal and tidal forces in relation to continent movement?
What conclusion did scientists reach about the strength of centrifugal and tidal forces in relation to continent movement?
What alternative outcome did one scientist propose if centrifugal forces were strong enough to move continents?
What alternative outcome did one scientist propose if centrifugal forces were strong enough to move continents?
What prediction did Wegener make regarding the deformation of continents if they were plowing through the ocean basins?
What prediction did Wegener make regarding the deformation of continents if they were plowing through the ocean basins?
In what year did Wegener first publish his book detailing his Continental Drift Hypothesis?
In what year did Wegener first publish his book detailing his Continental Drift Hypothesis?
Flashcards
Wegener's Continental Drift
Wegener's Continental Drift
The hypothesis that continents were once joined as a supercontinent (Pangaea) and have drifted to their current positions.
Pangaea
Pangaea
The supercontinent that existed approximately 300 million years ago.
Mechanism for Continental Drift
Mechanism for Continental Drift
The explanation for how continents could move.
Centrifugal and Tidal Forces
Centrifugal and Tidal Forces
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Problems with Wegener's Hypothesis
Problems with Wegener's Hypothesis
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Evidence needed for continental drift
Evidence needed for continental drift
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Hypothesis acceptance criteria
Hypothesis acceptance criteria
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Calculations of force
Calculations of force
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Mantle Convection
Mantle Convection
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Thermal Convection
Thermal Convection
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Convection Cells
Convection Cells
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Wegener's Idea - Drifting Continents
Wegener's Idea - Drifting Continents
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Holmes' Contribution
Holmes' Contribution
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