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