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