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