medium Nature

Which gas is most abundant in Earth's atmosphere?

Quiz Options

Oxygen
Nitrogen
Carbon Dioxide
Argon

Explanation

Nitrogen constitutes about 78% of the Earth's atmosphere.

CuizIN — Free Online Quiz Game | Play & Learn

Test your knowledge across 15,000+ trivia questions covering history, science, geography, sports, entertainment, literature, mythology, and more. Play free, earn points, climb the leaderboard.

Start Playing → · Create Account · How to Play

Browse Quiz Categories

Popular Sections

Why Play CuizIN?

100% free to play — no payment required
15,000+ trivia questions across 30+ categories
Daily streak bonuses and a global leaderboard
Detailed explanations after every answer
Mobile-friendly with offline support