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