Multiple choice general knowledge math & puzzles

Which of the following is not a constituent of the atmosphere?

  1. Oxygen

  2. Carbon Dioxide

  3. Aluminum

  4. Nitrogen

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

The Earth's atmosphere is primarily composed of Nitrogen (78%), Oxygen (21%), and trace gases like Carbon Dioxide. Aluminum is a metallic element found in the Earth's crust, not a gas or constituent of the atmosphere.