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