(i)Towns and Cities that first appeared along river valleys, such as Ur. Nippur and Mohenjodaro. were larger in scale than other human settlements. (ii) The ancient cities could develop only when an increase in food supplies made it possible to support A wide range of non-food producers. (iii) The cities were often the centre; of political power, administrative networks, trade and industry, religious institutions, and intellectual activity, and supported various social groups such as artisans, merchants and priests. But the industrialisation changed the form of urbanisation. The modern towns like London. Leeds. Manchester developed because they attracted large number of workers to the textile mills. (iv) The city of London became a powerful magnet for migrant populations, even though it did not hove large factories.