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