| Charcot Plate(expression, name, geology, plate) |
| Chattian(noun, name, volcano, geology) |
| Chiles(noun, name, volcano, geology) |
| Chimborazo(noun, name, volcano, geology) |
| Chipmunk Mountain(expression, name, volcano, geology) |
| Chivinar(noun, name, volcano, geology) |
| Chumash Peak(expression, name, volcano, geology) |
| Chusmiza(noun, name, volcano, geology) |
| Circum-Superior Belt(expression, name, volcano, geology) |
| City of Rocks State Park(expression, name, volcano, geology) |
| Clear Lake Volcanic Field(expression, name, volcano, geology) |
| Clisbako Caldera Complex(expression, name, volcano, geology) |
| Colahan Seamount(expression, name, volcano, geology) |
| Coniacian(noun, name, volcano, geology) |
| Coppermine River Group(expression, name, volcano, geology) |
| Coquihalla Mountain(expression, name, volcano, geology) |
| Coropuna(noun, name, volcano, geology) |
| Cotopaxi(noun, name, volcano, geology) |
| Crevasse Crag(expression, name, volcano, geology) |
| Croghan Hill(expression, name, volcano, geology) |