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Earth's atmosphere

the air we breath 8 Questions.

 
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laume69
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1

Dry air contains roughly (by volume) 78.08%

  • oxygen
  • nitrogen
  • argon

2

Air contains roughly (by volume) .... oxygen

  • 20.95%
  • 25.95%
  • 22.95%

3

Dry air contains roughly (by volume) 0.93%

  • carbon dioxide
  • argon
  • other gases

4

Air also contains a variable amount of water vapor, on average around

  • 5%
  • 3%
  • 1%

5

Three quarters of the atmosphere's mass is within about ..... of the surface

  • 15 km
  • 13km
  • 11 km

6

An altitude ... of marks the boundary where atmospheric effects become noticeable during atmospheric reentry of spacecraft.

  • 220 km
  • 120 km
  • 100 km

7

The exosphere is the uppermost layer of an atmosphere. From 500–1,000 km up to .....

  • 10,000 km
  • 20,000 km
  • 25,000 km

8

The average atmospheric pressure, at sea level, is about

  • 2.5
  • 1 atmosphere
  • 2 atmosphere

 

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