| Answer | Crossword Clue |
|---|---|
| LAVA | Extrusive rock. |
| DACITE | Extrusive rock. |
| andesite | an extrusive usually dark grayish rock consisting essentially of oligoclase or feldspar |
| trachyte | fine-grained volcanic rock consisting essentially of alkali feldspar and one or more subordinate minerals, as hornblende or mica: the extrusive equivalent of syenite |
