| Answer | Crossword Clue |
|---|---|
| apophysis | A small offshoot extending from an igneous intrusion into the surrounding rock |
| apophyses | A small offshoot extending from an igneous intrusion into the surrounding rock |
| xenoliths | A piece of rock within an igneous rock that is not derived from the original magma but has been introduced from elsewhere, esp. the surrounding country rock |
