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Nitrogen was introduced into Earth's atmosphere primarily through volcanic eruptions and the outgassing of nitrogen-rich gases from the Earth's interior during its formation. Additionally, biological processes, such as the fixation of atmospheric nitrogen by certain bacteria and plants, contributed to the nitrogen cycle, gradually increasing the nitrogen concentration in the atmosphere. Over geological time, these processes led to the establishment of the nitrogen-rich atmosphere we have today, which is composed of about 78% nitrogen.

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3w ago

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