The earth's atmosphere, which we refer to as air, is a mixture of approximately
A)78% oxygen, 21% nitrogen, and less than 1% carbon dioxide.
B)78% nitrogen, 21% oxygen, and less than 1% argon.
C)78% oxygen, 21% carbon dioxide, and less than 1% helium.
D)78% oxygen, 21% water vapor, and less than 1% ozone.

Question

Quizplus · Accepted Answer

The earth's atmosphere is primarily made up of nitrogen (78%) and oxygen (21%), with the remaining 1% consisting of various gases such as argon, carbon dioxide, and helium. Therefore, option B is the best choice as it accurately reflects the composition of the earth's atmosphere.

The Earth's Atmosphere, Which We Refer to as Air, Is