character: Professor Earth
topic: The Richter Scale and Measuring Earthquakes
grade: 9
subject: Science
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character: Professor Earth
topic: Understanding Seismographs
grade: 9
subject: Science
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character: Professor Earth
topic: Types of Earthquakes and Their Effects
grade: 9
subject: Science
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character: Professor Earth
topic: The Science of Plate Tectonics
grade: 9
subject: Science
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