Question

How much oxygen does the
atmosphere contain?
O 12%
0 76%
O 35%
0 26%

Answer 1

20.95%

Step-by-step explanation:

By volume, dry air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and small amounts of other gases. Air also contains a variable amount of water vapor, on average around 1% at sea level, and 0.4% over the entire atmosphere.