| Answer | Crossword Clue |
|---|---|
| STIMULUS | It causes a reaction |
| NUCLEARFUSION | It causes quite a reaction |
| ENZYME | It causes a breakdown |
| SPEEDOFSOUND | Exceeding it causes a boom |
| BELLYFLOP | It often causes a big splash |
| ALLERGEN | It may cause a reaction |
| IGET | "...it" (delayed reaction to a joke) |
| INERTGAS | It's hard to get a reaction out of it |
