| Altar(noun, name, volcano, geology) |
| Alto(noun, name, volcano, geology) |
| Alutate(noun, name, volcano, geology) |
| Amboy(noun, name, volcano, geology) |
| Amiata(noun, name, volcano, geology) |
| Ampiro(noun, name, volcano, geology) |
| Anahim Peak(expression, name, volcano, geology) |
| Anahim hotspot(expression, 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) |
| 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) |