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  - N-15/N-14 (3)
- noble gases
  - argon (1)
  - radon
    - Rn-220 (1)
    - Rn-222 (2)
- nodules (2)
- North America
  - Appalachians
    - Appalachian Plateau (1)
    - Piedmont (1)
    - Southern Appalachians (1)
    - Valley and Ridge Province (1)
  - Canadian Shield
    - Grenville Province (1)
  - Gulf Coastal Plain (1)
  - Western Interior
    - Western Interior Seaway (1)
- ocean basins (1)
- ocean circulation (1)
- ocean floors (7)
- ocean waves (1)
- Oceania
  - Polynesia
    - Hawaii
      - Hawaii County Hawaii