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