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