character: Mr. Johnson
topic: Plate Tectonics and Earth's Structure
grade: 10
subject: Geography
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character: Mr. Johnson
topic: Continental Drift Theories
grade: 10
subject: Geography
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character: Mr. Johnson
topic: Types of Plate Boundaries
grade: 10
subject: Geography
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character: Mr. Johnson
topic: Earth's Interior Layers
grade: 10
subject: Geography
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