| Answer | Crossword Clue |
|---|---|
| diedres | DIEDRE, an inwards angle in rock |
| diedre | an inwards angle in rock |
| grooves | An indentation where two planes of rock meet at an angle of more than 120░ |
| dihedrals | A place where two planes of rock meet at an angle of between 60░ and 120░ |
