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