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