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