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: Arthur Holmes
topic: Radioactive Heating in Earth's Interior
grade: 9
subject: Geography
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character: Marie Tharp
topic: Mapping the Ocean Floor and Plate Tectonics
grade: 9
subject: Geography
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