Evolution of a Mega City
A village becomes a town as it has more people and takes up more space.
A town becomes a city when it has several districts.
City becomes a metropolis when it joins another city. The metropolis of
Bangkok Thonburi is one example.
A metropolis becomes a mega city as it expands to include the smaller cities next to it. In a mega city, there is no green space, agricultural or forested areas between the cities. The communities become so tightly connected and it is hard to know when you have left one city •and entered another. This process is called urban sprawl.