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