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