Atmosphere
Encyclopedia article; The Columbia Encyclopedia, Sixth Edition, 2009
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...ozone, known as the ozone layer , at 12 30 mi (19 50...hydrogen, xenon, and ozone. The lower atmosphere...000 ft (5,500 m). Layers of the Earths Atmosphere...composed of distinct layers. The troposphere extends...troposphere is an atmospheric ozone layer, which is also the...