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Nitrogen makes up approximately 78% of the Earth's atmosphere. It also forms part of the DNA molecule, so it is in every cell of the human body. Nitrates and nitrites (ions that include nitrogen) are found in the soil where they are crucial to plant growth. In fact, the earth even has its own nitrogen cycle, similar to the water cycle. Nitrogen compounds have even been found in low concentrations in outer space. One of the more surprising places nitrogen is found (although it is not actually part of nature) is in beer, where it is used because it creates smaller bubbles.

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16y ago

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