567 gases in the world
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The length of Earth's equator is about 38,622 kilometres.
That's generally written as "What goes around the world and stays in a corner?" The answer is a stamp.
around the world
It is implied that you have already accounted for some gases and the question is about other gases. But you have provided no information about which gases you know about. Furthermore, there is no information on the context: is it the earth's atmosphere? That of another planet or satellite? Products of some chemical reaction?
75% nitrogen, 21% oxygen, 3% other gases.