If you found a line of volcanic peaks a few hundred miles long in which the volcanoes were progressively older toward one end of the line, what probably created them? a. a divergent boundary b. a transform boundary c. a hot spot d. a convergent boundary

It would be a hot spot
To put it simply, a hot spot is an area on a tectonic plate, where the magma is able to flow through easily, and it’s in the middle of the plate. As the plate moves, this magma coming from the middle of the plate ejects magma, which hardens to form volcanic islands

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.”