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