| Answer | Crossword Clue |
|---|---|
| COAL | One of the fossil fuels |
| goniatite | one of an extinct genus of fossil cephalopods, allied to the Ammonites |
| goniatites | GONIATITE, one of an extinct genus of fossil cephalopods, allied to the Ammonites |
| encrinite | a fossil crinoid, esp one belonging to, or resembling, the genus Encrinus |
| encrinites | ENCRINITE, a fossil crinoid, esp one belonging to, or resembling, the genus Encrinus |
| SOLAR | Alternative to fossil fuels |
| ACIDRAIN | Pollutant linked to fossil fuels |
| synfuel | a fuel derived from fossil fuels |
| synfuels | SYNFUEL, a fuel derived from fossil fuels |
