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