character: Andrew Lawson
topic: Earthquake Theory
grade: 12
subject: Geography
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character: Charles Richter
topic: Seismicity and Earthquake Measurement
grade: 12
subject: Geography
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character: Inge Lehmann
topic: Earth's Inner Core and Seismology
grade: 12
subject: Geography
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character: Harry Fielding Reid
topic: Elastic Rebound Theory
grade: 12
subject: Geography
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