Problem: Choose the best answer. How does lightning fix nitrogen? Need Assignment Help? The oxide in the atmosphere gets superheated by the lightning, which causes the lightning to bond with oxygen in the air to form nitrogen oxide. The oxides then get washed to earth through rain. The lightning in the atmosphere gets superheated by the nitrogen, which causes the nitrogen to bond with oxygen in the air to form nitrogen oxide. The oxides then get washed to earth through rain. The nitrogen in the atmosphere gets superheated by the lightning, which causes the nitrogen to bond with oxygen in the air to form nitrogen oxide. The oxides then get washed to earth through rain. The nitrogen in the atmosphere gets superheated by the lightning, which causes the lightning to bond with oxygen in the air to form lightning oxide. The nitrogen then get washed to earth through rain.