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Nitrous oxide from fossil fuels gets into the air because of factories.
Falls as nitric acid in rainwater. It also contributes to the air being 78% nitrogen gas.
Runoff from nitrates in farming enters water. Bacteria in soil and water fix nitrogen from the air.
Plants obtain nitrate ions from water and soil bacteria. The animals eat the plants.
Decomposer bacteria break down animal and plant matter into nitrogen compounds.
Nitrogen compounds eventually break down into gas and return to the air again, continuing the cycle.
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