character: Seismologist
topic: Earth's Structure and Seismic Waves
grade: 12
subject: Geography
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character: Geologist
topic: Types of Seismic Waves
grade: 12
subject: Geography
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character: Geophysicist
topic: Seismic Wave Propagation
grade: 12
subject: Geography
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character: Earth Scientist
topic: Composition of Earth's Layers
grade: 12
subject: Geography
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