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