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 | S | E | B |
| K | L | I | G | H | T | K | R | U |
| H | E | A | T | F | O | Q | I | R |
| L | A | O | C | M | U | I | F | N |
| F | O | S | S | I | L | S | L | I |
| U | T | V | K | O | M | M | F | N |
| E | S | N | I | A | M | E | R | G |
| L | E | N | E | R | G | Y | H | D |
| V | J | K | C | O | R | P | A | C |
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