Atmosphere
(Reguidit frae Oam)
The Yird's atmosphere is makkit o the gases in the lift aboot the planet. Thir's hauden aboot the yird bi its gravity. It conteens aboot 78% nitrogen an 21% oxygen, wi trace amoonts o ither gases. The atmosphere fends life on the yird bi absorbin ultraviolet Sun radiation an reducin temperatur differs atween the day an the nicht.
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