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