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Weather is mainly influenced by (1) _____, which can comprise up to (2) _____ of the total volume of the atmosphere.

  • A

    (1) water vapour  (2) 4%

  • B

    (1) carbon dioxide  (2) 1%

  • C

    (1) oxygen  (2) 5%

  • D

    (1) argon  (2) 0.04%

Up to approximately 60 km, the composition of the atmosphere is relatively constant.

  • Nitrogen: 78%
  • Oxygen: 21%
  • Other gases: 1%

Other gases include argon, carbon dioxide, ozone, carbon monoxide, water vapour etc… 
Water vapour content is highly variable, ranging from almost 0% in very cold polar air to about 4% by volume in hot, humid tropical air near the surface. 

This gas is fundamental to meteorology, as without it, there would be no weather.

Note: This question has also been reported as a multiple drop down style question in UK CAA. 

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