character: Charles Richter
topic: Richter Scale and Earthquake Magnitude
grade: 12
subject: Geography
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character: Seismologist
topic: Measurement of Earthquake Strength
grade: 12
subject: Geography
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character: Natural Disasters
topic: Impact of Earthquakes on Geography
grade: 12
subject: Geography
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character: Plate Tectonics
topic: Relationship to Earthquake Occurrence
grade: 12
subject: Geography
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