Nitrogen cycle

Crossword clues

Solve these clues to fill the grid.

Impregnation with ___ or a compound of ___

5 Across

The substance of a living cell

7 Across

Any compound containing the ___ group (plural)

8 Across

Abrupt electric discharge from cloud to cloud or from cloud to earth accompanied by the emission

9 Across

An erect or climbing bean or pea plant of the family ___ (plural)

1 Down

A pungent gas compounded of nitrogen and hydrogen

2 Down

The chemical process in which a nitro group is added to an organic compound

3 Down

Layer of air around the Earth

4 Down

The radical -NO2 or any compound containing it (plural)

6 Down

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