____ areas are densely populated towns or cities. Megacities are urban areas that have more than ____ inhabitants. An inhabitant is a person who ____ in that place. An example of a megacity is ____ . Urban areas are characterised by lots of roads, railways, airports, offices, services and complex networks providing gas, water and sewerage. These are examples of ____ . There are lots of opportunities for people in urban areas, for example high paid ____ . This lead to ____ moving to cities. Factors that attract people towards an area are called ____ factors. However, urban areas also experience ____ such as air, light, water and sound ____ . ____ is a major challenge in cities such as Shanghai as it can cause ____ concerns for the inhabitants.

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