character: Harry Hess
topic: Seafloor Spreading Theory
grade: 10
subject: Geography
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character: Alfred Wegener
topic: Continental Drift Theory
grade: 10
subject: Geography
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character: Arthur Holmes
topic: Convection Currents in the Mantle
grade: 10
subject: Geography
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character: John Tuzo Wilson
topic: Plate Tectonics
grade: 10
subject: Geography
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