character: Mr. Tom Williams
topic: Urban Development and Its Effects on Erosion
grade: 9
subject: Geography
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character: Sarah Johnson
topic: Impact of Urbanization on Local Watersheds
grade: 9
subject: Geography
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character: David Smith
topic: Erosion Control Techniques in Urban Areas
grade: 9
subject: Geography
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character: Maria Garcia
topic: Sustainable Urban Planning and Soil Conservation
grade: 9
subject: Geography
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