Gas Combined With Hydrogen to Make Ammonia

This page is the CodyCross answer for the clue below from Forests, Group 1987, Puzzle 1 (Phenology Studies).

Question is: Gas Combined With Hydrogen to Make Ammonia

and the answer is: NITROGEN

Word Meaning:

NITROGEN — (uncountable) The chemical element with an atomic number of 7 and atomic weight of 14.0067. It is a colorless and odorless gas.

Definitions from Wiktionary.

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