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