character: Sir Arthur Holmes
topic: Geological Time Scale
grade: 10
subject: Geography
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character: Alfred Wegener
topic: Continental Drift Evidence
grade: 10
subject: Geography
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character: Charles Lyell
topic: Geological Principles
grade: 10
subject: Geography
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character: Harry Hess
topic: Seafloor Spreading and Plate Tectonics
grade: 10
subject: Geography
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