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