character: John Milne
topic: Seismology
grade: 12
subject: Geography
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character: Charles Richter
topic: Richter Scale and Earthquake Magnitude
grade: 12
subject: Geography
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character: Richard Olsson
topic: Seismic Waves and Their Impact
grade: 12
subject: Geography
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character: Inge Lehmann
topic: Discovery of Earth's Inner Core
grade: 12
subject: Geography
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