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