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