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