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