character: Dr. Johnson
topic: Earth's Layers and Their Role in Plate Tectonics
grade: 9
subject: Geography
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character: Dr. Johnson
topic: Understanding the Lithosphere and Asthenosphere
grade: 9
subject: Geography
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character: Dr. Johnson
topic: The Mantle's Convection Currents and Plate Movement
grade: 9
subject: Geography
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character: Dr. Johnson
topic: The Role of the Core in Earth's Magnetic Field and Plate Tectonics
grade: 9
subject: Geography
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