When does air, water and soil become polluted

please give a brife discription for each...
6th std question
thank you

air: it gets polluted when fossil fules are burned they produce gases like carbon dioxide, carbon monooxide etc.
water: its gets polluted when microorganism and chemicals are dissolve in water bodeis and by frequent acid rain the ponds, lakes, and rivers get polluted.
soil: it gets polltued by fertilisers or pestisides it makes the soil unfertile or by deforestation the soil get exposed and moisture from soil quickly evaporated making the soil dry.
hope it helps.

by wind