| Aliso(noun, name, volcano, geology) |
| Alligator Lake(expression, name, volcano, geology) |
| Alligator Lake volcanic complex(expression, name, volcano, geology) |
| Almolonga(noun, name, volcano, geology) |
| Alney-Chashakondzha(expression, name, volcano, geology) |
| Alu-Dalafilla(expression, name, volcano, geology) |
| Aluchin(noun, name, volcano, geology) |
| Alutu(noun, name, volcano, geology) |
| Amak(noun, name, volcano, geology) |
| Amasing(noun, name, volcano, geology) |
| Ambalatungan Group(expression, name, volcano, geology) |
| Ambang(noun, name, volcano, geology) |
| Ambitle(noun, name, volcano, geology) |
| Ambre-Bobaomby(noun, name, volcano, geology) |
| Ambrym(noun, name, volcano, geology) |
| Amorong(noun, name, volcano, geology) |
| Amsterdam Island(expression, name, volcano, geology) |
| Amukta(noun, name, volcano, geology) |
| Anatahan(noun, name, volcano, geology) |
| Andahua-Orcopampa(noun, name, volcano, geology) |