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18-Jul-2017 21:08

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.

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Aurorae shown here at the bottom of the thermosphere can actually form at any altitude in this atmospheric layer.

The exosphere is located too far above Earth for any meteorological phenomena to be possible.

However, the aurora borealis and aurora australis sometimes occur in the lower part of the exosphere, where they overlap into the thermosphere.

Because the thermopause lies at the lower boundary of the exosphere, it is also referred to as the exobase.

The lower part of the thermosphere, from 80 to 550 kilometres (50 to 342 mi) above Earth's surface, contains the ionosphere.

The exosphere contains most of the satellites orbiting Earth.



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