Problem: Two sister cities were part of an air pollution study. While Prague had big air pollution problems, Belfast was eco-friendly and its inhabitants were healthy. Which city had fewer people with an increased chance of developing asthma?

A: Belfast

Problem: Pete and Laura were learning about Earth's vegetation. Laura read about savannas and subtropical vegetation, while Pete read about alpine tundras. Which person read more about the Pyrenees of Europe?

A: Pete

Problem: Two neighboring habitable planets from the same solar system, planet U and planet N, had Earth-like atmospheres. The inhabitants of planet U destroyed the ozone layer by their actions, while their neighboring planet N didn't. Which planet released less bromine gas in their atmosphere?

A: planet N

Problem: Monsoon plays a big role in shaping local climates. In some places of the Horn of Africa monsoon causes heavy rainfall. But across the Red Sea the Arabian Peninsula mostly misses the monsoon. As a result, they have minimal rainfall throughout the year. Which place would see more chemical weathering, Horn of Africa or Arabian Peninsula?

A:
Horn of Africa