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