The atmosphere is a mixture of gases that surrounds the Earth. It helps make life possible by providing us with air to breathe, shielding us from harmful ultraviolet (UV) radiation coming from the Sun, trapping heat to warm the planet, and preventing extreme temperature differences between day and night.
An atmosphere is a layer of gas or layers of gases that envelop any planet and is held in place by the gravity of the planetary body.
“The spheroidal gaseous envelope surrounding any of the heavenly bodies.”
Watch this video: Evolution of the Atmosphere
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