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ACIDRAIN
BIOETHICS
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DEFORESTATION
ECOLOGY
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OZONELAYER
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| Z | D | I | F | M | H | P | Y | D | F | Y | G | O | A | D |
| B | J | E | O | Y | Z | Q | U | E | C | O | T | Z | N | C |
| G | Z | D | F | E | Y | Y | B | G | L | V | B | O | O | P |
| T | S | C | O | O | T | R | I | O | D | F | S | N | R | H |
| V | U | E | N | H | R | H | C | K | T | R | L | E | Y | L |
| K | Y | S | I | B | G | E | I | L | A | M | A | L | D | Y |
| X | M | U | A | F | X | Q | S | C | T | Q | I | A | K | W |
| A | U | O | R | T | C | A | L | T | S | I | P | Y | I | G |
| A | U | H | D | K | Z | E | A | X | A | Z | F | E | P | W |
| Y | X | N | I | J | H | I | H | P | K | T | Q | R | K | N |
| S | V | E | C | C | G | W | T | Y | U | R | I | N | S | L |
| L | L | E | A | Z | J | L | R | K | X | R | I | O | L | N |
| B | O | R | H | U | F | U | M | W | Q | Y | U | O | N | R |
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