Multiple choice

___________ and _________ are the major components of air?

  1. Water vapour and Carbon dioxide

  2. Argon and Nitrogen

  3. Nitrogen and Oxygen

  4. Xenon and Helium

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Together, nitrogen and oxygen constitute about 99% of Earth's atmosphere. Nitrogen comprises roughly 78% and oxygen about 21%.