character: John Muir
topic: The Impact of Erosion on National Parks
grade: 9
subject: Geography
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character: National Parks Service
topic: Erosion Control and Conservation Methods
grade: 9
subject: Geography
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character: Geologists
topic: The Geological Processes of Erosion in Natural Landscapes
grade: 9
subject: Geography
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character: Environmental Scientists
topic: Impact of Human Activity on Erosion in National Parks
grade: 9
subject: Geography
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