character: J.Tuzo Wilson
topic: Plate Tectonics
grade: 9
subject: Science
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character: Alfred Wegener
topic: Continental Drift Theory
grade: 9
subject: Science
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character: Harry Hess
topic: Seafloor Spreading
grade: 9
subject: Science
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character: John Tuzo Wilson
topic: Hotspots and Mantle Plumes
grade: 9
subject: Science
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