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