character: Soil Formation
topic: The Role of Tephra in Soil Development
grade: 9
subject: Geography
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character: Volcanic Ash
topic: Influence on Soil Properties and Fertility
grade: 9
subject: Geography
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character: Igneous Rocks
topic: Contributions to Soil Composition
grade: 9
subject: Geography
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character: Erosion Processes
topic: Interaction with Tephra in Soil Formation
grade: 9
subject: Geography
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