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