Do you know what Gas makes up most of the earth’s atmosphere?

On this page, we will discuss what Gas makes up most of the earth’s atmosphere. The atmosphere of Earth, commonly known as air, is the layer of gases retained by Earth’s gravity that surrounds the planet and forms its planetary atmosphere.

The most abundantly present gas in the atmosphere by far is nitrogen, which accounts for about 78% of the mass of dry air. While the second most abundant gas in the atmosphere is Oxygen, present at levels of 20 to 21%. 

List of available gases in the atmosphere and their percentages

Gas NameChemical FormulaPercent Volume
*WaterH2O0 to 4%
*Carbon DioxideCO20.0360%
*Nitrous OxideN2O0.00003%

Search Geography Grade 12 Study Resources

Looking for something in particular?

Search and find some of the useful resources for Grade 12 Geography including: Past Papers, Exercises, Class Assessments Plans, Assignments and Answers, Research Tasks, Essays Topics and more. Resources are for all terms: Term 1, Term 2, Term 3, and Term 4. 


Looking for something specific?