| Answer | Crossword Clue |
|---|---|
| SHALE | Possible source of petroleum |
| SHALE | Petroleum source |
| SHALE | Petroleum source. |
| OILDEPOSIT | Underground petroleum source |
| PERIL | Source of possible harm |
| MANATEE | Possible source of mermaid legends |
| CAESARSALAD | Possible source of salmonella poisoning |
| RAWEGG | Possible source of salmonella poisoning |
| TVQUIZSHOW | Possible source of big winnings |
| HOTMIC | Possible source of unwanted feedback, for short |
| BISMARCK | "Politics is the art of the possible" source |
| CANDIDE | Source of the line "If this is the best of all possible worlds, what are the others?" |
