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