anodont dentition - argyrodite
- arctic mist
- Arctic pole
- Arctic region
- arctic sea smoke
- arctic smoke
- Arctic suite
- arctic whiteout
- arctic zone
- arctocyonids
- arcual distance
- arcual distance from station to epicenter
- arcuate
- arcuate end moraine
- arcuate outcrop
- arcuate ring-dike
- arcuation
- arculites
- arcus
- ardealite
- ardennite
- ardmorite
- arduinite
- are
- are available in a full range
- area
- area distortion ratio
- area in advance
- area of ablation
- area of accumulation
- area of adnation
- area of artesian flow
- area of decay
- area of draw
- area of efflux
- area of evaporation
- area of face
- area of faulting
- area of foundering
- area of gas-lift flow
- area of ground water discharge