Hover or tap underlined Spanish terms to see their translation and exam tip.
Hasta los 80 km de altitud, la atmósfera terrestre tiene una composición más o menos constante y uniforme, donde el Nitrógeno (N) ocupa en porcentaje un volumen igual a:Up to 80 km altitude, the Earth’s atmosphere has a roughly uniform composition in which Nitrogen (N) makes up by volume:
Show the answer
Correct answer: b) 78%
Why it is correct
Throughout the homosphere (up to about 80 km) the dry-gas ratio stays constant at 78% nitrogen, 21% oxygen and 1% argon and trace gases.
Why the others are not
- a) 21% is the share of oxygen.
- c) 1% is argon and trace gases.
- d) 1% to 4% is the variable share of water vapour.
How to work it out in the exam
- Homosphere (up to 80 km): 78% nitrogen.
Where this question comes from
- Junta de Andalucía · 2017 · 2ª convocatoria · CY Módulo genérico · question 2 Official paper · Official answer key
Pending instructor review. Machine translation, not reviewed.