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