Unit 9 APhug

● Annexation: Legally adding land area to a city in the United States.

● Census tract: An area delineated by the U.S. Bureau of the Census for which statistics are

published; in urban areas, census tracts correspond roughly to neighborhoods.

● Central Business District (CBD): The area of a city where retail and office activities are

clustered.

● Central city: An urban settlement that has been legally incorporated into an

independent, self-governing unit.

● Concentric Zone Model: A model of the internal structure of cities in which social groups

are spatially arranged in a series of rings.

● Edge city: A node of office and retail activities on the edge of an urban area.

● Galactic (or Peripheral) Model: A model of North American urban areas consisting of an

inner city surrounded by large suburban residential and business areas tied together by a

beltway or ring road.

● Gentrification: A process of converting an urban neighborhood from a predominantly

low-income, renter-occupied area to a predominantly middle-class, owner-occupied

area.

● Megalopolis: A continuous urban complex in the northeastern United States.

● Multiple Nuclei Model: A model of the internal structure of cities in which social groups

are arranged around a collection of nodes of activities.

● Public housing: Government-owned housing rented to low-income people.

● Sector model: A model of the internal structure of cities in which social groups are

arranged around a series of sectors, or wedges, radiating out from the central business

district (cbd).

● Sprawl: Development of new housing sites at relatively low density and at locations that

are not contiguous to the existing built-up area.

● Suburb: A residential or commercial area situated within an urban area but outside the

central city.

● Urban area: A dense core of census tracts, densely settled suburbs, and low-density land

that links the dense suburbs with the core.

● Urban cluster: In the United States, an urban area with between 2,500 and 50,000

inhabitants.

● Urbanized area: In the United States, an urban area with at least 50,000 inhabitants.