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