How does nitrogen eventually return to the atmosphere?

Answer 1

The Nitrogen cycle.

Nitrogen fixation: Nitrogen fixing bacteria in root nodules of legumes fix nitrogen from the atmosphere into ammonia. This is the natural equivalent of the Haber process.

Nitrification: Nitrites and Nitrate are produced from ammonium by Nitrifying bacteria. Nitrates are required by plants for the production of proteins.

Ammonification: The production of ammonia by microorganisms from dead plant and animals.

These process cycle Nitrogen from the air throughout the ground. Nitrogen is returned to the amosphere by:

Denitrification: Produces Nitrogen gas. The complete opposite of nitrification, ie Nitrates to Nitrites to Ammonia to Nitrogen gas.

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Answer 2

Maya Adams

Nitrogen returns to the atmosphere through a process called denitrification, where bacteria convert nitrates and nitrites back into nitrogen gas.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.