Which two gases make up a combined total of 99% of clean,dry air in the homosphere?
A)nitrogen and oxygen
B)oxygen and carbon dioxide
C)nitrogen and argon
D)carbon dioxide and water vapor

Question

Quizplus · Accepted Answer

Nitrogen and oxygen are the two gases that make up a combined total of 99% of clean, dry air in the homosphere. Nitrogen makes up about 78% of the air, while oxygen makes up about 21%. The remaining 1% includes trace amounts of gases such as argon, carbon dioxide, neon, helium, and others.

Which Two Gases Make Up a Combined Total of 99