Hover or tap underlined Spanish terms to see their translation and exam tip.
Acerca de la composición de la atmósfera marque la opción correcta.Concerning the composition of the atmosphere, mark the true statement:
Show the answer
Correct answer: c) Up to 35 km altitude nitrogen makes up approximately 78% of total air volume
Why it is correct
Up to about 35–80 km altitude the dry gas mix is uniform and nitrogen accounts for roughly 78% of the total volume.
Why the others are not
- a) Water vapour decreases rapidly with altitude.
- b) The most abundant gas is nitrogen (78%), not oxygen (21%).
- d) Argon accounts for less than 1%.
How to work it out in the exam
- Nitrogen up to 35 km: ~78% by volume.
Where this question comes from
- Junta de Andalucía · 2026 · 2ª convocatoria · CY Módulo genérico · question 1 Official paper · Official answer key
Pending instructor review. Machine translation, not reviewed.