Hover or tap underlined Spanish terms to see their translation and exam tip.
Hasta unos 35 km de altitud, los gases más abundantes en la atmósfera son:Up to about 35 km altitude, the most abundant gases in the atmosphere are:
Show the answer
Correct answer: a) Oxygen (21%) and Nitrogen (78%)
Why it is correct
In the homosphere dry air keeps a uniform mix dominated by nitrogen (78%) and oxygen (21%), which together account for 99% by volume.
Why the others are not
- b) Nitrogen is nearly four times as abundant as oxygen.
- c) Argon makes up less than 1% (0.93%).
- d) Carbon dioxide is only around 0.04%.
How to work it out in the exam
- Dry air: 78% nitrogen and 21% oxygen.
Where this question comes from
- Junta de Andalucía · 2016 · 2ª convocatoria · CY Módulo genérico · question 2 Official paper · Official answer key
Pending instructor review. Machine translation, not reviewed.