Question

earth science: nitrogen cycle 10 question quiz 6/10 6) which process in the nitrogen cycle turns nitrogen into ammonium? fixation nitrification assimilation ammonification denitrification submit for webquest or practice, print a copy of this quiz at the earth science: nitrogen cycle webquest print page.

Explanation:

In the nitrogen - cycle, nitrogen fixation is the process that converts atmospheric nitrogen ($N_2$) into ammonia ($NH_3$) or ammonium ($NH_4^+$). Nitrification converts ammonium to nitrites and then nitrates. Assimilation is the uptake of nitrogen compounds by plants and animals. Ammonification is the conversion of organic nitrogen to ammonium. Denitrification converts nitrates to nitrogen gas.

Answer:

Fixation