Physical Geography
Nitrogen is a colorless, odorless gas that makes up about 78% of the Earth's atmosphere by volume. It is essential for life as it is a key component of amino acids, proteins, and nucleic acids, playing a crucial role in various biological processes. Nitrogen exists in multiple forms in the environment, including atmospheric nitrogen (N2), which is inert and not directly usable by most organisms, making its conversion into reactive forms vital for sustaining life.
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