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