Land use
Energy
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BIOFUEL
COAL
ISOTOPES
KEROGEN
MAGMA
MELTDOWN
MINERAL
NATURAL
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RESOURCE
RESOURCES
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| L | A | R | U | T | A | N | E | E |
| S | E | P | O | T | O | S | I | S |
| A | L | E | U | F | O | I | B | O |
| M | O | A | O | U | Z | Z | B | U |
| G | K | E | R | O | G | E | N | R |
| A | O | C | O | A | L | Y | B | C |
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| S | M | I | N | E | R | A | L | J |
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