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Half the mass of the atmosphere is found in the lowest..
  • A
    5 km.
  • B
    8 km.
  • C
    3 km.
  • D
    11 km.
Refer to figure.
  • 1013 hPa = sea level
  • 850 hPa = 5 000 ft (1 525 m)
  • 700 hPa = 10 000 ft (3 050 m)
  • 500 hPa = 18 000 ft (5 500 m)
  • 400 hPa = 24 000 ft (7 315 m)
  • 300 hPa = 30 000 ft (9 150 m)
  • 250 hPa = 34 000 ft (10 360 m)
  • 200 hPa = 39 000 ft (11 890 m)
According the standard atmosphere at 5000m the atmospheric pressure is 540 hPa.
This is approximately half of the atmospheric pressure at sea level (=1013) so the closes answer will be 5 km.

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