Review Images #2 - Population Geography
Transcript of Review Images #2 - Population Geography
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Review Images #2:Population Geography
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Arithmetic Density
People per square mi or km
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Physiologic Density
People per sq mi or km of arable (farmable) land
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Why Is Physiologic Density Important?
Carrying capacity!Egypt: 98% of the people live on 3% of
the land
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Distribution vs. Density
Density in Diagram a? Diagram b?
What differs?
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World’s 4 Major Population Clusters
In which four global regions is the world’s population clustered?East Asia, South Asia, Western Europe, Eastern North
America
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Too ColdToo Hot, Too Dry
Too Wet Too High
Why is Population Unevenly Distributed?
Some locations are …
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At a Global Scale,Climate, Landforms and Resources
Influence Human Settlement Patterns
Which climate zones are most preferable for human habitation?
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U.S. Population Distribution
Megalopolis: long chain of continuous metropolitan areas
Megalopolis
20% of U.S. pop.
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Mean Center of U.S. Population Has Shifted West and South
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Malthus: Population Will Outstrip Food Supply
Why have Malthus’s predictions not come true?
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World Population Growth by Region
Which regions are growing at the fastest pace? Slowing down?
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Demographic Transition
What is the Demographic Transition?
What other changes does it correlate to?
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What Causes Death and Birth Rates to Fall?
• Death Rates fall with improvements in:– Health care– Hygiene– Sanitation– Food supply
• Birth Rates fall with:– Education, esp. of women– Birth control (available and affordable)– Industrialization– Economic opportunity– Increased standard of living
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Pyramids Illustrate Age & Gender Composition or
Structure
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Age-gender groups
are called cohorts.
Your cohort
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Developing Countries Developed Countries
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Youth Bulge and Aging Populations: Both Present Challenges
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Population Pyramids Reflecting 4 Stages of Demographic Transition
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AIDS Impacted Populations
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As countries develop economically, people are more likely to die of chronic diseases than contagious diseases.
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Introduction to the U.S. Census
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Which states and regions gained representatives? Lost? Why?
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Electoral Vote Apportionment After Census 2010
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GIS Helps Us Visualize Census Data
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International Forced Migration
“Largest and most devastating forced migration in human history.”
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Ravenstein’s Laws of Migration1. Every migration flow generates a return or
counter-migration.2. The majority of migrants move a short
distance.3. Migrants who move longer distances tend to
choose big-city destinations.4. Urban residents are less migratory than rural
residents.5. Families are less likely to make international
moves than young adults.
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The Friction of Distance and The Gravity Model
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African Islands of Development
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Diaspora: Involuntary Mass Dispersion
African Diaspora
Jewish Diaspora
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Hurricane Katrina Diaspora 2005
Ravenstein’s Laws of Migration In Action?
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Immigration Waves
How do U.S. immigration waves differ?
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Historical Migration Flows
Who? Where? Why?
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International Net Migration
Blue? Brown? Green?
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More and Less Developed Regions
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Contemporary Migration FlowsStalker’s Guide to International Migration
Who? Where? Why?
LDCs to MDCs
Colonial ties
Regional islands of development
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What relationship does population
composition have to international
migration pulls and pushes?
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Asylum Seekers
How are asylum seekers different from basic migrants?
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Zaatari Refugee Camp in Jordan
How are refugees different from basic migrants?
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U.S. Domestic Migration
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Indian Removal 1830s -1840s
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The Great Migration 1916-1930
Pull factors: job opportunities, less racism
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Reverse Great Migration1995-2000
Pull factors: New job opportunities, family ties, improving race
relations
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Urban To Suburban 1950s -1990s
Pull factors: more open space, lower housing prices, new job opportunities
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Rust Belt to Sunbelt1960s-Present
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Pull factors: less commuting time, lower transportation costs, lower housing costs,
urban amenities
Current - Suburban to Urban
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North Dakota Oil Boom
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