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