character: Mid-Ocean Ridges
topic: Seafloor Spreading Process
grade: 10
subject: Geography
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character: Seafloor Spreading
topic: Tectonic Plate Movement
grade: 10
subject: Geography
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character: Ocean Floor Features
topic: Geological Structures
grade: 10
subject: Geography
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character: Plate Tectonics
topic: Continental Drift Theory
grade: 10
subject: Geography
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