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