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