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The Earth's atmosphere has 78.08% nitrogen, 20.95%oxygen, 0.93% argon, and 0.038% carbon dioxide.
No one gas comprises 99% of the atmosphere, but nitrogen (~78.09%) and oxygen (~20.95%) together comprise about 99% of the atmosphere (on a dry basis, i.e. not including water vapor which can range from near 0% to 5%).
Plankton gives more oxygen to the atmosphere.
The atmosphere consists of about 20%, Nitrogen being the main component at over 70%
No it isn't. We still have about 21% oxygen content in the atmosphere.
21% of the atmosphere is oxygen.
Oxygen forms 21 percent of the Earth's atmosphere.
The atmosphere would be much more volatile.
40 percent
Oxygen is the gas that makes up about 21 percent of the Earth's atmosphere.
The mass percent of oxygen is approximately 21% in Earth's atmosphere.
Air is 20.5 percent oxygen.
97%
The Earth
The approximate percent of oxygen in Earth's lower atmosphere is around 20.95% by volume.
Oxygen makes up about 21% of Earth's atmosphere.
Approximately 21% of Earth's atmosphere is made up of oxygen.