Nitrogen cycle
Nitrogen cycle
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AMMONIA
AMMONIFICATION
ATMOSPHERE
DENITRIFICATION
LEGUMES
LIGHTNING
NITRATES
NITRIFICATION
NITRITES
PROTOPLASM
| V | M | G | N | I | N | T | H | G | I | L | L | G | K | N |
| Y | X | A | U | A | Y | R | H | T | E | B | R | D | O | M |
| U | A | M | M | O | N | I | F | I | C | A | T | I | O | N |
| X | S | E | M | U | G | E | L | D | M | N | T | U | X | G |
| O | E | R | E | H | P | S | O | M | T | A | I | V | R | U |
| Z | L | S | R | T | Y | C | O | J | C | F | I | P | G | M |
| V | G | E | I | E | Y | N | U | I | Y | B | K | L | H | A |
| E | J | T | F | Y | I | T | F | F | D | A | N | H | X | Z |
| R | F | A | O | A | C | I | G | M | G | R | D | K | O | O |
| V | E | R | M | P | R | O | T | O | P | L | A | S | M | U |
| S | T | T | J | T | E | W | R | X | L | E | H | K | S | U |
| A | K | I | I | A | Y | B | K | U | U | U | D | Z | S | N |
| V | T | N | I | T | R | I | T | E | S | F | O | T | G | C |
| T | E | P | H | W | C | M | S | Z | C | P | M | E | X | M |
| D | H | C | N | Y | K | S | K | S | W | N | Y | A | L | K |
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