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