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