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