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