Consider the importance of the atmosphere. Why is nitrogen essential for life on Earth?

If the atmospheric composition changes to include 25%, how might this impact living organisms?

The atmosphere is essential for life because it provides oxygen and protects living organisms from harmful solar radiation. Which component of the atmosphere is responsible for the protection against solar radiation?

The presence of water vapor and pollutants like methane and ozone in the atmosphere suggests what about air quality?

The atmosphere contains trace amounts of various gases. Which of the following is NOT typically found in dry air?

Evaluate the impact of air pollutants such as CFCs on the atmosphere. What is the significant consequence of their presence?

What happens to the atmosphere  as one moves higher into the sky?

Analyze the relationship between altitude and atmospheric pressure based on the understanding that the atmosphere merges with space rather than ending abruptly. What can be inferred? 

Evaluate the implications of a thinner atmosphere on human life as one ascends into higher altitudes. 

Analyze the implications of having no defined boundary for the atmosphere. What might this suggest about space exploration?