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Urbanization, Centripetal and Centrifugal Movements

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Presentation on theme: "Urbanization, Centripetal and Centrifugal Movements"— Presentation transcript:

1 Urbanization, Centripetal and Centrifugal Movements
IB Geography II


3 Bell Ringer: Make a list of 5 valid claims relating to patterns of urbanization you can see in the map

4 The Process of Urbanization
Urbanization: the process by which an increasing percentage of a country’s population comes to live in towns and cities. It may involve both rural-urban migration and natural increase.

5 Causes of urbanization
Rural to urban migration Natural Increase

6 Rural – urban migration
Rural to urban migration – result of push and pull factors

7 Push and pull factors Push factors Pull factors
Difficult/harsh climate – eg. droughts Chance of a better life Struggle to provide food for family Better housing and amenities Very low income Chance of good jobs – higher wages, more varied employment High rates of population growth have put pressure on natural resources such as water/energy/land Better medical/health care Can’t afford to fertilizers to increase yields Children able to go to school Mechanization of farming favors rich farmer and leads to unemployment or underemployment of poor farmer.

8 Natural increase The people that migrate into towns and cities tend to be young resulting in high levels of natural increase high % of young adults = high levels of births Falling death rates due to improved medical care means more babies are born than people dying, further increasing the urban population


10 % urban population


12 World Urban Population

13 Elbow Partner Discussions
Using the last two data slides, discuss this question: Why are there higher rates of urbanization in developing nations compared to developed nations?

14 Graphing Global Urbanization Activity
Step 1: Take 5 minutes to read/annotate data set. Be sure to read definition of agglomerations for notecards! Step 2: In elbow partners, answer the following questions: How many urban agglomerations had a population greater than 10 million in 1950? Where were these urban areas? Describe the changes in the number and location of urban agglomerations in 1975, 2000, and 2010. What changes does the UN project for 2025?

15 Graphing Global Urbanization Activity
Step 3: Graph the Data. Create a comparative bar graph showing bars for each of the following continents (N. America, S. America, Europe, Asia, Africa) and different colors for each time period in the handout Y axis will be number of urban areas in each time period in each continent

16 Graphing Global Urbanization Activity
Step 4: Analyze the data. In one paragraph, answer the following prompt using data from your graph as resources. Discuss changing patterns of urbanization from


18 Centripetal Movements involve the migration of people into towns and cities

19 Urban Processes can be seen as inward and outward movements
Inward Movement (Centripetal) Rural to urban migration, gentrification, re-urbanization, urban renewal Outward Movement (Centrifugal) Suburbanization, urban sprawl, counter-urbanization

20 Rural Push Factors High rates of population growth have put pressure on natural resource such as water and energy and reduced the size of land holdings New farming technology favors the rich farmer, but for others it leads to unemployment or underemployment Migration for work is often the only option (See complete list of rural push factors in yesterday’s notes)

21 Urban Pull Factors Higher wages More varied employment
Educational opportunities (See complete list in earlier notes)

22 The Consequences of Urbanization
Economic Growth: Urban economies are almost always more productive than rural ones Industrial productivity is higher in cities. Cities are usually responsible for a greater percentage of total GDP

23 The Consequences of Urbanization
Gentrification The Reinvestment of capital into inner-city areas. Improvement in residential areas It is a type of filtering that may lead to the social displacement of poor people (as a place becomes gentrified, housing prices rise and the poor are unable to afford it– often times minorities)

24 The Consequences of Urbanization
Re-urbanization: (urban renewal) the development of activities to increase residential population densities within the existing built-up area of a city. This may include the redevelopment of vacant land and the refurbishment of housing and the development of new businesses.

25 The Consequences of Urbanization
Brownfield Sites: abandoned or underused industrial buildings and land, which may be contaminated but have potential for redevelopment

26 Centrifugal Movements

27 Centrifugal Movements
Also known as Decentralization The outward movements of a population from the center of a city towards its edge or periphery, resulting in the expansion of a city.

28 Suburbanization Suburb: a residential area just outside the boundaries of a city. Suburbanization: the outward growth of towns and cities to engulf surrounding villages and rural areas. This may result from the out-migration of population from the inner urban areas to the suburbs.


30 Urban Sprawl The unplanned and uncontrolled physical expansion of an urban area into the surrounding countryside. It is closely linked with the process of suburbanization. Good examples of Urban Sprawl include Mexico City


32 Counter-Urbanization
A process involving the movement of populations away from inner urban areas to a new town, new estate, commuter town or village on the edge or just beyond the city limits or rural-urban fringe. Characteristic of wealthy cities in MEDCs It is a response to increasing stress of overcrowding, congestion, pollution and crime.

33 Reasons for counter-urbanization
Increased car ownership Increased wealth De-industrialization Relocation of industry/employment to rural urban fringe Desire for safe, pleasant environment, the rural ideal/utopia Perception of urban areas as dangerous, high levels of crime, racial/ethnic problems – ‘white flight’ Change in tenure from public/renting to private ownership. Sell property and move out.

34 The Consequences of Centrifugal Movements
Centrifugal movements involve a shift of population and economic activity from the center of the urban area to its periphery and beyond, which is detrimental to the center. Construction of roads and buildings destroy open space and increases air pollution

35 Response to Consequences
Urban Planners have focused on ways of reviving the urban center(urban renewal/gentrification) and restricting new construction in urban hinterlands Hinterlands: the zone surrounding a city

36 The Family Life Cycle Intra-urban population movement may involve shifts of population during the family life cycle. A person is likely to move around different zones of city depending on their age and their need for a house of a certain size.

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