Which statement about the layers of Earth is true? A.
The mantle consists of molten iron.
B.
The inner core of Earth is made up of molten nickel.
C.
The lithosphere is the outermost layer of Earth.
D.
The mesosphere is sometimes referred to as the crust.

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.”