SESKStuff Everyone Should Know
SESK: Stuff Everyone Should Know · sesk.info/aero-atmosphere-air-envelope

What is Earth's atmosphere?

It is the envelope of air surrounding Earth.

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  1. A layer of ocean water
  2. An envelope of surrounding air ✔
  3. A solid shell above clouds

Why: The atmosphere is the mixture of gases held around Earth. Aircraft fly within this air envelope.

Huh, didn't know that: There is no single sharp boundary where all atmosphere suddenly ends and space begins.

The dad joke
Why did Earth keep an atmosphere? It needed some space for air!
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References

Answer: An envelope of surrounding air. The atmosphere is the mixture of gases held around Earth. Aircraft fly within this air envelope.

  1. Civil Air Patrol, Journey of Flight Teacher's Guide www.gocivilairpatrol.com/media/cms/2nd_edition_Teachers_Guide_5D3166D76F9B1.pdf
    It is the envelope of air surrounding the Earth.
    Checked 2026-10-10.

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