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