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