an extended urban area, typically consisting of several towns merging with the suburbs of one or more cities
infilling
redevelopment that identifies and develops vacant parcels of land within previously built areas
megacities
a city with a population of more than 10 million
gentrification
the process of wealthier residents moving into a neighborhood and making it unaffordable for existing residents; usually improves housing quality, but older and lower income residents can no longer afford to live there
high-density housing
typically made up of multiple family high rise apartments or high priced single family flats- residents pay monthly rent to a landlord: common in the CBD where land prices are high
squatter settlement
an informal housing area beset with overcrowding and poverty that features temporary homes often made of wood scraps or metal sheeting
concentric zone model
a model of urban development depicting a city growing outward from a central business district in a series of concentric rings
edge cities
a type of community located on the outskirts of a larger city with commercial centers with office space, retail complexes, and other amenities typical of an urban center
gravity model
a model that predicts the interactin between two or more places; based on Newton's law of universal gravitation
