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In this way, Earth's atmosphere can be divided (called atmospheric stratification) into five main layers.
Excluding the exosphere, the atmosphere has four primary layers, which are the troposphere, stratosphere, mesosphere, and thermosphere.
Air also contains a variable amount of water vapor, on average around 1% at sea level, and 0.4% over the entire atmosphere.
Air content and atmospheric pressure vary at different layers, and air suitable for use in photosynthesis by terrestrial plants and breathing of terrestrial animals is found only in Earth's troposphere and in artificial atmospheres.
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.
Various industrial pollutants also may be present as gases or aerosols, such as chlorine (elemental or in compounds), fluorine compounds and elemental mercury vapor.
However, temperature has a more complicated profile with altitude, and may remain relatively constant or even increase with altitude in some regions (see the temperature section, below).
The study of Earth's atmosphere and its processes is called atmospheric science (aerology).Conformément à la loi "Informatique et liberté" les informations demandées sont nécessaires au traitement de votre demande et pourront être communiquées à des tiers.En application de la Loi n° 78-17 du 06/01/1978, relative à l’informatique, aux fichiers et aux libertés, vous disposez d’un droit d’accès et de rectification aux données vous concernant.The atmosphere has a mass of about 5.15 three quarters of which is within about 11 km (6.8 mi; 36,000 ft) of the surface.The atmosphere becomes thinner and thinner with increasing altitude, with no definite boundary between the atmosphere and outer space.