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 | H | T |
| O | H | P | E | T | R | O | L | Z |
| A | R | E | M | A | I | N | S | G |
| L | X | B | M | B | V | P | T | N |
| F | O | S | S | I | L | S | H | I |
| U | I | H | M | B | C | E | G | N |
| E | L | R | O | O | A | A | I | R |
| L | X | E | E | T | K | D | L | U |
| P | Y | G | R | E | N | E | O | B |
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