Which two gases make up most of Earth’s atmosphere?
Answer and explanation
Correct answer: Nitrogen and oxygen
The composition concept identifies nitrogen and oxygen as the dominant gases in dry air. Nitrogen makes up roughly 78% and oxygen roughly 21%, so together they account for about 99% and option A is correct. Carbon dioxide and ozone are present in much smaller quantities, hydrogen and helium are not the main atmospheric gases, and dust and smoke are particles rather than gases.
Frequently asked questions
What is the correct answer to this question?
Nitrogen and oxygen
Why is this the correct answer?
The composition concept identifies nitrogen and oxygen as the dominant gases in dry air. Nitrogen makes up roughly 78% and oxygen roughly 21%, so together they account for about 99% and option A is correct. Carbon dioxide and ozone are present in much smaller quantities, hydrogen and helium are not the main atmospheric gases, and dust and smoke are particles rather than gases.
Which subject and chapter does this question cover?
This is a Class 11 Accountancy question. Chapter: Introduction to Accounting. Topic: Accounting Information.
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