Which gas is most abundant in the Earth’s atmosphere? EASY 1 Point -0.25 Negative MCQ #1267 General Knowledge General Science PPSC Provincial PSCs Question Which gas is most abundant in the Earth's atmosphere? Options A Oxygen B Carbon Dioxide C Hydrogen D Nitrogen Reveal Answer Reset 📝 Explanation Nitrogen (N₂) makes up approximately 78% of the Earth's atmosphere. Oxygen accounts for about 21%, and the remaining 1% includes argon, CO₂, and other gases. ← Previous MCQ📋 All MCQs📚 LearnNext MCQ → Related MCQs MEDIUM Blood type AB is called MEDIUM Blood type O is called EASY The Earth takes approximately how long to orbit the Sun?