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The World
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Supertopics:
Things
Natural Things
Subtopics:
Geological Things
Air
Bodies of Land
Bodies of Water
Dust
Minerals
Mountains
Sand
Soil (Dirt)
Biological Things
Organisms
Biological Compounds
Food
Drugs
Natural Resources
Particular Natural Resources
Mining (Resource Extraction)
Natural Resource Depletion
Places Rich in Natural Resources Are Often Poor (Resource Curse)
Recycling; Reuse