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