The layers of gases surrounding a planet is the atmosphere.
An atmosphere is defined as the layers of gases surrounding a planet. Our earth's atmosphere is composed of about 78% nitrogen, 21% oxygen, and 1 % other gases. There many layers of atmosphere such as troposphere, stratosphere, mesosphere, thermosphere, and exosphere. Each layer has unique features such as temperature and pressure.
So we can conclude that the layers of gases surrounding a planet is the atmosphere.
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