character: Professor Mark Brown
topic: History of Earthquake Studies
grade: 9
subject: Geography
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character: Charles Richter
topic: Development of the Richter Scale
grade: 9
subject: Geography
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character: John Milne
topic: Seismology Pioneer
grade: 9
subject: Geography
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character: William Hobbs
topic: Tectonic Plates and Earthquake Analysis
grade: 9
subject: Geography
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