Nitrogen fixation is the process of turning nitrogen gas into forms that are usable by plants, and this process can occur in three ways. Learn about nitrogen fixation's occurrence in lightning, industrial factories and bacteria withhelp from a science teacher and field biologist in this free video on biology. Expert: Brian Erickson Contact: Ericksontutoring.blogspot.com Bio: Brian Erickson is a tutor in math and science, as well as a field biologist. Filmmaker: Todd Green

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