character: Alfred Wegener
topic: Continental Drift Theory
grade: 9
subject: Geography
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character: Pangaea
topic: Formation of Supercontinents
grade: 9
subject: Geography
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character: Tectonic Plates
topic: Movement and Interaction
grade: 9
subject: Geography
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character: Harry Hess
topic: Seafloor Spreading Theory
grade: 9
subject: Geography
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