Question

Which correctly list the three gases that each make up less than 1 percent of Earth’s atmosphere?

argon, water vapor, carbon dioxide
oxygen, argon, water vapor
nitrogen, oxygen, carbon dioxide
carbon dioxide, oxygen, argon

Answer 1

argon, water vapor, carbon dioxide

(argon ≈0.93%, carbon dioxide ≈0.04%, and water vapor is variable but typically under 1%; nitrogen and oxygen are much greater than 1%.)