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