nitrogen, oxygen, carbon dioxide nitrogen, carbon dioxide, oxygen oxygen, nitrogen, carbon dioxide carbon dioxide, oxygen, nitrogen
I gave my students this multiple choice question: Three gases found in Earth's atmosphere are carbon dioxide, nitrogen, and oxygen. What is their order of abundance from greatest to least?

Only one answer is correct among these 4 choices:
- nitrogen, oxygen, carbon dioxide
- nitrogen, carbon dioxide, oxygen
- oxygen, nitrogen, carbon dioxide
- carbon dioxide, oxygen, nitrogen

Could you tell me which one is correct?

nitrogen, oxygen, carbon dioxide