Learn more about argon, the gas you didn't know was the third most common in our atmosphere: http://en.wikipedia.org/wiki/Argon
@AnticitizenOne I answered the same as you. It's okay; getting it wrong proves you didn't cheat and google it. :)
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@AnticitizenOne I answered the same as you. It's okay; getting it wrong proves you didn't cheat and google it. :)