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