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