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