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