Oxygen is a component of the Earth's atmosphere. It makes up about 21% of the air we breathe.
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Nitrogen is the largest component of Earth's present atmosphere, making up about 78% of the total gases in the atmosphere.
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Oxygen is the component of Earth's atmosphere that exists entirely as a result of photosynthesis. Plants and other photosynthetic organisms convert carbon dioxide into oxygen during the process of photosynthesis.
One component of the Earth's atmosphere is nitrogen, which makes up about 78% of the atmosphere. Other key components include oxygen (21%) and trace amounts of gases like carbon dioxide, argon, and water vapor.
Yes, krypton is a trace gas in Earth's atmosphere, but it only makes up about 1 part per million by volume. It is not considered a major component of Earth's atmosphere.