character: Zhang Heng
topic: The Seismograph, an invention to detect earthquakes
grade: 3
subject: History
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character: Aristotle
topic: Early theories on earthquakes and natural phenomena
grade: 3
subject: History
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character: Thomas Jefferson
topic: Interest in natural disasters and scientific observation
grade: 3
subject: History
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character: Galileo Galilei
topic: The study of motion and its relation to earthquakes
grade: 3
subject: History
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