issb general knowledge MCQ #873

Which gas is most abundant in Earth's atmosphere (wave 14)?

issb general knowledge MCQ #873

  1. Question 1

    Q1. Which gas is most abundant in Earth's atmosphere (wave 14)?

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

    Answer: Nitrogen

    Explanation: Nitrogen makes up about 78 percent of the atmosphere. Work each step carefully; ISSB math rewards accuracy under time pressure.