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CONDUCTION
CONVECTION
CORE
CRUST
CYCLE
ELECTROMAGNETIC
MANTLE
MATERIAL
MINERAL
NATURAL
NONRENEWABLE
ORE
PETROLEUM
RADIATION
RECYCLING
RESOURCE
TEMPERATURE
THERMAL
| E | R | A | E | L | T | N | A | M | W | V | C | C | G | L |
| Y | L | R | U | V | B | V | U | Q | A | P | E | P | H | E |
| A | Y | E | P | E | T | R | O | L | E | U | M | R | X | L |
| E | R | O | C | O | N | D | U | C | T | I | O | N | S | B |
| A | E | J | O | T | H | E | R | M | A | L | Y | V | L | A |
| N | C | Y | N | E | R | E | C | Y | C | L | I | N | G | W |
| X | R | E | V | M | A | O | R | E | Q | C | D | Z | R | E |
| K | U | J | E | P | D | C | M | I | N | E | R | A | L | N |
| E | O | W | C | E | I | Y | A | A | U | V | W | M | V | E |
| V | S | I | T | R | A | C | T | X | G | B | S | X | Y | R |
| C | E | C | I | A | T | L | E | U | A | N | K | C | O | N |
| P | R | B | O | T | I | E | R | G | X | Z | E | Y | U | O |
| N | M | U | N | U | O | C | I | L | A | R | U | T | A | N |
| F | P | S | Q | R | N | Z | A | I | I | Q | N | W | I | E |
| N | D | F | V | E | G | Y | L | F | E | T | S | U | R | C |
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