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