character: John Tuzo Wilson
topic: Hotspots and Plate Boundaries
grade: 10
subject: Geography
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character: Harry Hess
topic: Seafloor Spreading
grade: 10
subject: Geography
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character: Alfred Wegener
topic: Continental Drift
grade: 10
subject: Geography
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character: Wegener's Theory
topic: Plate Tectonics
grade: 10
subject: Geography
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