6. how are climates closer to the
poles similar to the tops of
vertical climates?

They are farther away from the path of the sun. The equator is almost always directly in the pathway on the sun, while the poles aren’t.

Air pollution: “combustion results in gases such as nitrogen oxides, nitrogen dioxide and particulates. the main causes of air pollution include transport, domestic combustion and industrial processes. pollutants from these sources can cause problems in the immediate vicinity and a distance away.”

The answer is d., a mountain.