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character: Eratosthenes
topic: Measuring the Earth's Circumference
grade: 9
subject: Geography
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character: Eratosthenes
topic: Geographical Coordinate System
grade: 9
subject: Geography
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character: Ptolemy
topic: Ancient Cartography
grade: 9
subject: Geography
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character: Aristotle
topic: Spherical Earth Theory
grade: 9
subject: Geography
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