| Answer | Crossword Clue |
|---|---|
| COALMINE | Rich source of fossil fuel |
| COAL | Fossil fuel |
| GAS | Fossil fuel |
| OIL | Fossil fuel |
| SOOT | Fossil fuel residue |
| COAL | A fossil fuel |
| GAS | Refined fossil fuel |
| COAL | Certain fossil fuel |
| COALER | Fossil fuel freighter |
| PEATS | Fossil fuel blocks |
| COALBIN | Fossil fuel container |
| COALER | Fossil-fuel hauler |
| COALER | Fossil fuel transport |
| COAL | Old-time fossil fuel |
| COALERS | Ships transporting fossil fuel |
| NATURALRESOURCE | Fossil fuel, e.g. |
| SEACOAL | Fossil fuel found on coasts |
| SEACOAL | Fossil fuel found in coastal veins |
