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character: Eratosthenes
topic: Measuring the Earth's circumference
grade: 10
subject: Geography
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character: Ptolemy
topic: Geographical coordinates and Earth's measurements
grade: 10
subject: Geography
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character: Isaac Newton
topic: Gravitational effects on Earth's shape
grade: 10
subject: Geography
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character: Bernhard Riemann
topic: Geometry of Earth's surface and dimensions
grade: 10
subject: Geography
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