3. (a). A power plant releases a grey smog plume that contains a high concentration of SO2 into the atmosphere around 6

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3. (a). A power plant releases a grey smog plume that contains a
high concentration of SO2 into the atmosphere around 6 am. As the
sun warms the atmosphere, the movement of the plume in the upward
direction is restricted, and the plume moves downwards. The
condition results in elevated ground-level concentrations of SO2
downwind from the source.
(i). Using an illustration, identify the type of plume
produced.
(ii). Explain the factor that contributes to the formation of
this plume.
(6 marks)
(b). Acidity or alkalinity is determined by the amount of
hydrogen and hydroxyl ions in the soil. Explain how each of the
following phenomena eventually makes soil more acidic:
(i). removal of metal cations by roots
(ii) leaching of soil with CO2-saturated water
(4 marks)