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