character: Incas
topic: Terracing Techniques in Ancient Peru
grade: 9
subject: Geography
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character: Andean Farmers
topic: Agricultural Practices in High Altitude Regions
grade: 9
subject: Geography
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character: Ancient Peruvians
topic: Impact of Terracing on Food Production
grade: 9
subject: Geography
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character: Geographers
topic: Geographic Features and Agriculture in the Andes
grade: 9
subject: Geography
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