The atmosphere redistributes heat and moisture among different regions via air currents, and provides the chemical and climate conditions that allow life to exist and evolve on Earth.OverviewThe atmosphere of Earth consists of a layer of mixed (commonly referred to as air) that is retained by, surrounding the 's . It contains variable quantities of suspended and that. . The three major constituents of Earth's atmosphere are,, and . Water vapor accounts for roughly 0.25% of the atmosphere by mass. In the lower atmosphere, the concentration of water vapor (a gr.
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