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