character: Dr. Emily Stone
topic: Geologist and Soil Composition
grade: 9
subject: Biology
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character: Professor Soilman
topic: Understanding the Layers of Soil
grade: 9
subject: Biology
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character: Ms. Greenfield
topic: Types of Soil and Their Properties
grade: 9
subject: Biology
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character: Mr. Earth
topic: The Role of Soil in Ecosystems
grade: 9
subject: Biology
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