1, Living things need nitrogen to survive but first it should be changed into a form they can use., 2, Nitrogen fixing (lightning): lightning fixes the nitrogen and then it enters the soil., 3, Nitrogen fixing (plants): plants roots have a type of bacteria that also fixes the nitrogen. Plants take in or absorb from the soil., 4, Bacteria on the plant roots turn the nitrogen into ammonia., 5, Bacteria in the soil change ammonia into nitrites and then nitrates which are two substances that contain nitrogen., 6, Plants absorb nitrates from the soil to grow. Animals get the nitrogen from the nitrates in plants., 7, Nitrates from animal waste and decayed plants return to the soil and bacteria turn this back into nitrogen gas., 8, Nitrogen gas is returned to the atmosphere and the nitrogen cycle continues.

Grade 5 Nitrogen Cycle

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