The nitrоgen cycle is yоur prоfessors fаvorite biogeochemicаl cycle. Complete the following sentences with the most аppropriate choice: In the nitrogen cycle, lightning takes nitrogen from the [pool1] in the chemical form [chem1] and moves it into the [pool2]. NH4+ is converted to NO2- by the process of [process1]. Industrial processes convert atmospheric nitrogen to ammonia. This process is called [process3].