Fossil fuels
Starter
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BURNING
CAPROCK
CHEMICAL
COAL
ENERGY
FIRE
FOSSILS
FUEL
HEAT
HEAT
LIGHT
OIL
PETROL
REMAINS
SMOKE
| Y | G | R | E | N | E | R | I | F |
| S | N | I | A | M | E | R | L | B |
| K | L | S | Q | K | A | A | U | L |
| C | A | M | L | T | C | R | F | I |
| O | O | O | L | I | N | D | U | G |
| R | C | K | M | I | S | P | E | H |
| P | N | E | N | U | O | S | L | T |
| A | H | G | H | E | A | T | O | M |
| C | N | P | E | T | R | O | L | F |
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