character: Dr. Marie Tharp
topic: Ocean Floor Mapping
grade: 12
subject: Geography
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character: Alfred Wegener
topic: Continental Drift Theory
grade: 12
subject: Geography
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character: James Cameron
topic: Deep-Sea Exploration
grade: 12
subject: Geography
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character: John Harrison
topic: Longitude and Mapping the Seas
grade: 12
subject: Geography
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