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