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