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