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