what are 3 processes that fix atmosphere nitrogen?

Three processes that fix atmospheric nitrogen include biological nitrogen fixation, where certain bacteria convert nitrogen gas into ammonia; industrial nitrogen fixation, exemplified by the Haber-Bosch process that synthesizes ammonia from nitrogen and hydrogen; and abiotic fixation, which occurs through natural events like lightning, where high temperatures and pressures convert nitrogen gas into nitrates. These processes play a crucial role in making nitrogen accessible for plants and other organisms.