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100

areas with low concentrations of people

rural

100

 the process of developing towns and cities

urbanization

100

meaning the population of cities contains a greater variety of people

social heterogeneity

100

areas with high concentrations of people

urban

100

the location of a place relative to its surroundings and its connectivity to other places

situation

200

a collection of adjacent cities economically connected, across which population density is high and continuous

metropolitan area/metro area

200

cities shaped by the distance people can walk

pedestrian cities

200

consists of at least 50,000 people, the county in which it is located, and adjacent counties that have a high degree of social and economic integrated with the urban core; (another way to define a city)

Metropolitan statistical area (MSA)

200

focal point in a matrix of connections

nodal region

200

defined as a central city plus land developed for commercial, industrial, or residential purposes, and includes surrounding suburbs

urban areas

300

an indicator of the proportion of the population that lives in cities and towns as compared to those that live in rural areas

percent urban

300

communities that grew up along rail lines

streetcar suburbs

300

the permanently inhabited portion of the earth’s surface

ecumene

300

consists of an urban center (the city) and its surrounding territory and agricultural villages

city-state

300

used to describe urban growth based on transportation technologies

Borchert's transportation model
400

area generally associated with defensible sites and river valleys in which seasonal floods and fertile spoils allowed for an agricultural surplus

urban hearth

400

a place with a permanent human population

settlement

400

a higher-density areas with territory inside officially recognized political boundaries

city

400

describes the characteristics at the immediate location

site

400

primarily residential areas near cities

suburbs

500

the shrinking "time-distance" or relative distance between locations

time-space compression
500

cities with more than 10,000 people and the county it lies in and surrounding counties with a high degree of integration

Micropolitan statistical area

500

exert influence far beyond their national boundaries

world cities (global cities)

500

ranking based on influence or population size

urban hierarchy 

500

command centers on a regional and occasionally national level

nodal cities

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