WONDER #1489: What Is Air Made of?

Question 1 of 3

Which gas makes up most of the air around you?

1. Nitrogen
2. Oxygen
3. Water vapor
4. Argon

Question 2 of 3

Which element in air is most important to human survival?

1. Nitrogen
2. Oxygen
3. Water vapor
4. Argon

Question 3 of 3

Other than oxygen and nitrogen, all the other trace elements make up about what percentage of air?

1. 50%
2. 99%
3. 1%
4. 25%

Check your answers online at https://wonderopolis.org/wonder/What-Is-Air-Made-of.