3. Livestock farming creates large amounts of animal waste. How would this affect the nitrogen cycle?
The waste contains a fair amount of nitrogen, which is useful as a fertilizer, and some does volatilize off. The nitrogen in the waste comes from their feed. This is simply a part of the nitrogen cycle. Plants need nitrogen to grow, when eaten the animals excrete the nitrogen, which goes back to the soil to be taken up by new plants in order to grow.