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 | D | Y |
| C | H | R | T | H | G | I | L | G |
| G | E | E | G | S | L | G | P | R |
| N | A | M | M | L | A | D | E | E |
| I | T | A | I | I | O | T | T | N |
| N | H | I | B | S | C | L | R | E |
| R | P | N | P | S | I | A | O | K |
| U | X | S | M | O | K | E | L | R |
| B | E | R | I | F | U | E | L | Z |
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