| Induan(noun, name, volcano, geology) |
| Insular Plate(expression, name, geology, plate) |
| Island Park Caldera(expression, name, volcano, geology) |
| Islay Hill(expression, name, volcano, geology) |
| Iso-Naakkima(expression, name, geology, crater) |
| Itcha Range(expression, name, volcano, geology) |
| Jarellon(noun, name, volcano, geology) |
| Jingu Seamount(expression, name, volcano, geology) |
| Juan de la Vega(expression, name, volcano, geology) |
| Ka'ula(noun, name, volcano, geology) |
| Kaena Ridge(expression, name, volcano, geology) |
| Kammu Seamount(expression, name, volcano, geology) |
| Kari-Kari(noun, name, volcano, geology) |
| Kasimovian(noun, name, volcano, geology) |
| Kelly West crater(expression, name, geology, crater) |
| Keurusselka(expression, name, geology, crater) |
| Kimmei Seamount(expression, name, volcano, geology) |
| Kimmeridgian(noun, name, volcano, geology) |
| Ko'olau Range(expression, name, volcano, geology) |
| Koko Guyot(expression, name, volcano, geology) |