principal quantum number
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- speciation
- organoclay
- cuesta
- sial
- Suspended solids
- rock terrace
- soil subtype
- acid geochemical barrier
- discharge hydrograph
- temperature barrier
- ferganite
- old plate tectonics
- limonite
- precision processing
- artificial radioactive element
- layering of relief
- ala twin
- descloizite
- greenwich meridian
- volcanic ejecta