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Interesting facts Argon is created when the potassium in the earth's crust decays. It's the most abundant of rare gases. It emits light when electronically excited. About .94% of the earth's atmosphere contains argon.
Answer The Earth's atmosphere contains roughly by volume: 78.08% nitrogen 20.95% oxygen 0.93% argon 0.038% carbon dioxide and trace amounts of other gases, and a variable amou â¦ nt of water vapor.