| Ampiro(noun, name, volcano, geology) |
| Anallajsi(noun, name, volcano, geology) |
| Ananopa(noun, name, volcano, geology) |
| Andagua volcanic field(expression, name, volcano, geology) |
| Andaman Islands(expression, name, volcano, geology) |
| Anderson Bay(expression, name, volcano, geology, north) |
| Anilao Hill(expression, name, volcano, geology) |
| Animas(noun, name, volcano, geology) |
| Anjouan Island(expression, name, volcano, geology) |
| Anjuisky(noun, name, volcano, geology) |
| Antiparos(noun, name, volcano, geology) |
| Antipin(noun, name, volcano, geology) |
| Antipodes Island(expression, name, volcano, geology) |
| Antofalla(noun, name, volcano, geology) |
| Aonoyama(noun, name, volcano, geology) |
| Aoso(noun, name, volcano, geology) |
| Apacheta-Aguilucho volcanic complex(expression, name, volcano, geology) |
| Apagado(noun, name, volcano, geology) |
| Apan-Tezontepec(noun, name, volcano, geology) |
| Apas-Navenchauc(noun, name, volcano, geology) |