character: Dr. Smith
topic: Heavy Metals and Their Impact on Soil Quality
grade: 9
subject: Chemistry
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character: Ms. Johnson
topic: Soil pH and Its Importance in Agriculture
grade: 9
subject: Chemistry
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character: Mr. Lee
topic: The Role of Nutrients in Soil Health
grade: 9
subject: Chemistry
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character: Dr. Patel
topic: Contamination Sources and Remediation Techniques
grade: 9
subject: Chemistry
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