character: Seismology Sam
topic: Understanding Seismic Waves
grade: 9
subject: Science
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character: Dr. Wave
topic: Types of Seismic Waves
grade: 9
subject: Science
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character: Geologist Gail
topic: How Earthquakes Occur
grade: 9
subject: Science
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character: Rita Richter
topic: Measuring Earthquake Magnitude
grade: 9
subject: Science
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