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