| Harra es-Sawad(expression, activity, name, volcano, geology) |
| Harra of Arhab(expression, activity, name, volcano, geology) |
| Harras of Dhamar(expression, activity, name, volcano, geology) |
| Hayes Volcano(expression, activity, name, volcano, geology) |
| Hayli Gubbi(expression, activity, name, volcano, geology) |
| Home Reef(expression, activity, name, volcano, geology) |
| Hoodoo Mountain(expression, activity, name, volcano, geology) |
| Hudson Mountains(expression, activity, name, volcano, geology) |
| Hunga Tonga(expression, activity, name, volcano, geology) |
| Irazu Volcano(expression, activity, name, volcano, geology) |
| Isabela Island(expression, activity, name, volcano, geology) |
| Jabal Yar(expression, activity, name, volcano, geology) |
| Jabal al-Tair Island(expression, activity, name, volcano, geology) |
| Kanehekili Fluctus(expression, activity, name, volcano, geology) |
| Karpinsky Group(expression, activity, name, volcano, geology) |
| Kasatochi Island(expression, activity, name, volcano, geology) |
| Kick 'em Jenny(expression, activity, name, volcano, geology) |
| Kikai Caldera(expression, activity, name, volcano, geology) |
| Klyuchevskaya Sopka(expression, activity, name, volcano, geology) |
| Kolokol Group(expression, activity, name, volcano, geology) |