character: Dr. Marie Tharp
topic: Ocean Floor Mapping
grade: 12
subject: Geography
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character: Alfred Wegener
topic: Plate Tectonics Theory
grade: 12
subject: Geography
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character: Harry Hess
topic: Seafloor Spreading
grade: 12
subject: Geography
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character: J. Tuzo Wilson
topic: Transform Boundaries
grade: 12
subject: Geography
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