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The approximate percent of oxygen in Earth's lower atmosphere is around 20.95% by volume.
Approximately 20 percent of the Earth's atmosphere is made up of oxygen.
Oxygen makes up about 21% of Earth's lower atmosphere by volume.
The approximate percentage of oxygen in Earth's lower atmosphere is around 21% by volume.
Oxygen is the gas that accounts for about 20 percent of Earth's atmosphere.
Earth's atmosphere is mostly made up of nitrogen, which makes up 79 percent. The atmosphere contains 20 percent oxygen and 1 percent other gases.
Nitrogen and oxygen make up 99% of Earth's atmosphere.
The most prominent gases are nitrogen (78 percent), oxygen (21 percent) and argon (nine-tenths of a percent).
Earth's atmosphere is mostly made up of nitrogen, which makes up 79 percent. The atmosphere contains 20 percent oxygen and 1 percent other gases.
The earths atmosphere is made up of 78% nitrogen and 21% oxygen
21% of the atmosphere is oxygen.
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