Question

Air is made of mostly oxygen, nitrogen, argon, carbon dioxide, and small amounts of other substances. Air is a __________

Answer 1

Earth's atmosphere is composed of a mixture of gases we call air. Air is mostly nitrogen (78%) and oxygen (21%), with some argon (0.93%), carbon dioxide (0.03%), ozone, watervapor, and other gases (less than 0.04% together).

Answer 2

Air is made of mostly oxygen, nitrogen, argon, carbon dioxide, and small amounts of other substances. Air is a gas.