character: Dr. Sarah Johnson
topic: Paleomagnetism and Its Significance in Understanding Continental Drift
grade: 9
subject: Science
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character: Alfred Wegener
topic: Theory of Continental Drift
grade: 9
subject: Science
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character: Charles Lyell
topic: Principles of Geology and Earth's History
grade: 9
subject: Science
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character: Harry Hess
topic: Seafloor Spreading and Its Role in Plate Tectonics
grade: 9
subject: Science
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