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