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