issb general knowledge MCQ #140

Which gas makes up the largest share of dry air in Earth's atmosphere?

issb general knowledge MCQ #140

  1. Question 1

    Q1. Which gas makes up the largest share of dry air in Earth's atmosphere?

    • A) Oxygen
    • B) Carbon dioxide
    • C) Argon
    • D) Nitrogen

    Answer: Nitrogen

    Explanation: Nitrogen forms about 78 percent of dry air by volume. Oxygen is the next most abundant gas at roughly 21 percent.