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