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Filtered air includes trace amounts of many other chemical compounds.Many substances of natural origin may be present in locally and seasonally variable small amounts as aerosols in an unfiltered air sample, including dust of mineral and organic composition, pollen and spores, sea spray, and volcanic ash.The three major constituents of air, and therefore of Earth's atmosphere, are nitrogen, oxygen, and argon.

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In this way, Earth's atmosphere can be divided (called atmospheric stratification) into five main layers.

The concentration of water vapor (a greenhouse gas) varies significantly from around 10 ppm by volume in the coldest portions of the atmosphere to as much as 5% by volume in hot, humid air masses, and concentrations of other atmospheric gases are typically quoted in terms of dry air (without water vapor).

among which are the greenhouse gases, principally carbon dioxide, methane, nitrous oxide, and ozone.

Thus, the exosphere no longer behaves like a gas, and the particles constantly escape into space.

These free-moving particles follow ballistic trajectories and may migrate in and out of the magnetosphere or the solar wind.

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