| Answer | Crossword Clue |
|---|---|
| SURGE | Groundswell |
| QUAKE | Groundswell cause |
| QUAKE | Groundswell causer |
| FROSTHEAVE | Cold weather groundswell that can cause pavement damage |
| groundswells | GROUNDSWELL, a broad, deep undulation of the ocean caused by a distant gale or earthquake |
