| Answer | Crossword Clue |
|---|---|
| ERA | Period of significant activity |
| TIDALWAVE | Result of significant submarine activity |
| ERA | Significant period of time |
| ERA | Significant period of time. |
| buildup | A period of excitement and preparation in advance of a significant event |
| buildups | A period of excitement and preparation in advance of a significant event |
| classical | Of or relating to the first significant period of an area of study |
| careers | An occupation undertaken for a significant period of a person's life and with opportunities for progress |
