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