character: John Tuzo Wilson
topic: Plate Tectonics Theory
grade: 9
subject: Geography
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character: Alfred Wegener
topic: Continental Drift Theory
grade: 9
subject: Geography
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character: Harry Hess
topic: Seafloor Spreading
grade: 9
subject: Geography
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character: Jason Morgan
topic: Hotspot Theory
grade: 9
subject: Geography
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