Oxygen makes up 1/_ of the Earth's atmosphere.
Understand the Problem
The question is asking about the fraction of the Earth's atmosphere that is composed of oxygen. It requires knowledge of atmospheric composition and can be solved by recognizing that oxygen constitutes approximately 21% of the atmosphere, equating to a fraction of 1/5.
Answer
5
Oxygen makes up 21% of the Earth's atmosphere, which is approximately 1/5.
Answer for screen readers
Oxygen makes up 21% of the Earth's atmosphere, which is approximately 1/5.
More Information
The Earth's atmosphere is composed of approximately 21% oxygen, which can be roughly estimated as 1/5 of the atmosphere.
Tips
A common mistake is forgetting to convert percentage to fraction or approximating incorrectly.
Sources
- What's in the Air? - UCAR Center for Science Education - scied.ucar.edu
- What is the atmosphere of Earth made of? - Cool Cosmos - Caltech - coolcosmos.ipac.caltech.edu
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