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