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