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