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