character: John Wesley Powell
topic: Exploration of the Colorado River and the Grand Canyon
grade: 9
subject: Geography
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character: David Thompson
topic: Geographical exploration of Canada and mapping river systems
grade: 9
subject: Geography
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character: Alexander von Humboldt
topic: Geographical discoveries and the relationship between erosion and river valleys
grade: 9
subject: Geography
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character: Ferdinand Magellan
topic: Exploration that included understanding coastal erosion and maritime geography
grade: 9
subject: Geography
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