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BIOFUEL
BIOMASS
ISOTOPES
KEROGEN
MAGMA
MANTLE
MELTDOWN
MINERAL
NATURAL
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RESOURCE
RESOURCES
| Y | S | S | A | M | O | I | B | S |
| C | N | E | E | Q | L | K | E | L |
| L | W | P | K | H | A | C | E | E |
| A | O | O | E | U | R | A | L | U |
| V | D | T | R | U | U | M | T | F |
| O | T | O | O | N | T | G | N | O |
| M | L | S | G | A | A | A | A | I |
| E | E | I | E | B | N | M | M | B |
| R | M | I | N | E | R | A | L | L |
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