character: Inca Empire
topic: Land and Water Management Techniques
grade: 4
subject: Social Studies
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character: Aqueduct Builders
topic: Incan Agricultural Innovations
grade: 4
subject: Social Studies
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character: Terrace Farmers
topic: Farming on Mountain Slopes
grade: 4
subject: Social Studies
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character: Chinampas
topic: Ancient Water Management Systems
grade: 4
subject: Social Studies
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