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