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