| Barrier(noun, name, volcano, geology) |
| Boring Lava Field(expression, name, volcano, geology) |
| Campanian Ignimbrite eruption(expression, name, volcano, geology) |
| Cape Purvis(expression, name, volcano, geology) |
| Capricorn Assemblage(expression, name, volcano, geology) |
| Capulin Volcano National Monument(expression, name, volcano, geology) |
| Carrizozo Malpais(expression, name, volcano, geology) |
| Cerro Arenales(expression, name, volcano, geology) |
| Cerro Bravo(expression, name, volcano, geology) |
| Cerro Chao(expression, name, volcano, geology) |
| Cerro Chascon-Runtu Jarita complex(expression, name, volcano, geology) |
| Cerro Machin(expression, name, volcano, geology) |
| Cerro Negro de Mayasquer(expression, name, volcano, geology) |
| Cerro Pantoja(expression, name, volcano, geology) |
| Cerro Porquesa(expression, name, volcano, geology) |
| Cerro Tujle(expression, name, volcano, geology) |
| Chachani(noun, name, volcano, geology) |
| Chaine des Puys(expression, name, volcano, geology) |
| Chaxas(noun, name, volcano, geology) |
| Cheakamus Valley basalts(expression, name, volcano, geology) |