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