| Answer | Crossword Clue |
|---|---|
| ashfalls | ASHFALL, a deposit of volcanic ash |
| ashfall | a deposit of volcanic ash |
| ashfall | rain of airborne ash resulting from a volcanic eruption |
| pozzolana | A type of volcanic ash used for mortar or for cement that sets under water |
| vulcanian | relating to a volcanic eruption, esp one that discharges gases and ash but little or no lava also VOLCANIAN |
| volcanian | relating to a volcanic eruption, esp one that discharges gases and ash but little or no lava also VULCANIAN |
