| Ubinas(noun, name, volcano, geology) |
| Ungava magmatic event(expression, name, volcano, geology) |
| Yucca Mountain(expression, name, volcano, geology) |
| cenozoic impact crater(expression, geology, history, earth, crater) |
| cenozoic orogeny(expression, geology, history, earth, orogeny) |
| cenozoic rift(expression, geology, history, earth, rift) |
| Mount Pleasant Caldera(expression, name, volcano, geology) |
| Sugarloaf Mountain(expression, name, volcano, geology) |
| Thumb(noun, expression, name, volcano, geology) |
| Aalenian(noun, name, volcano, geology) |
| Abbott Seamount(expression, name, volcano, geology) |
| Acraman crater(expression, name, geology, crater) |
| Adare Peninsula(expression, name, volcano, geology) |
| Ailsa Craig(expression, name, volcano, geology) |
| Akaroa(noun, name, volcano, geology) |
| Al Harrah(expression, name, volcano, geology) |
| Albian(noun, name, volcano, geology) |
| Amelia Creek crater(expression, name, geology, crater) |
| Anahim Peak(expression, name, volcano, geology) |
| Andagua volcanic field(expression, name, volcano, geology) |