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