Hover or tap underlined Spanish terms to see their translation and exam tip.
Acerca de la atmósfera, señale la opción verdadera.About the Earth’s atmosphere and its gases, mark the true option:
Show the answer
Correct answer: d) Up to an approximate height of 35 km, in the atmospheric gas mix 21% of total volume is oxygen and 78% is nitrogen.
Why it is correct
Across the lower tens of kilometres of the atmosphere, dry air keeps a uniform ratio of 78% nitrogen and 21% oxygen.
Why the others are not
- a) The share of water vapour varies widely with place and weather.
- b) It carries suspended solid and liquid aerosols.
- c) Water vapour is the main driver of weather phenomena.
How to work it out in the exam
- Up to 35 km: 78% nitrogen and 21% oxygen.
Where this question comes from
- Junta de Andalucía · 2022 · 3ª convocatoria · CY Módulo genérico · question 1 Official paper · Official answer key
Pending instructor review. Machine translation, not reviewed.