# Bell Ringer Miniature Earth – If the population of the Earth were shrunk to just 100 people, but the proportions were kept the same, what would it look.

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Bell Ringer Miniature Earth – If the population of the Earth were shrunk to just 100 people, but the proportions were kept the same, what would it look like? This video will show us.

POPULATION

What is a primary tool of demographers?
What is Demography? study of population What is a primary tool of demographers? Census- survey of population, done every 10 years by the federal government

What is Population Distribution?
Habitable Lands - 2/3 of population between 20*N and 60*N Urban-Rural Mix – ½ of population lives in cities, more each year Migration – people moving, causes change in population Push Factors – reasons people leave home Pull Factors – reasons people come to new home

Global Population Distribution

What is Population Density?
The number of people in a unit of space. Example: “8,500 people per square mile”

How do demographers determine who is growing?
Birth rates and Death rates

What are Birth Rates? Birth Rate – number of live births per 1000 people Fertility Rate – average number of children a woman will have in her lifetime

What are Death Rates? Death (Mortality) Rate – number of deaths per 1000 people Infant Mortality Rate – number of deaths among infants under 1 year old, per 1000 live births

What is Rate of Natural Increase?
Rate of Natural Increase- % a population grows in one year Birth Rate minus Death Rate = Rate of Natural Increase

What is Doubling Rate? Doubling rate- number of years it takes for a population to double.To figure the growth rate: 70 / Rate of Natural Increase (RNI) = Number of years to double population Example: Mexico has an RNI of 1.7, so 70/1.7 = 41.17… so Mexico will double in population in about 41 years!

Population Growth Over Time “The J Curve”

What caused the growth rate to increase?
Technology- Any invention, innovation (new idea) or tool that increases production.

When did the population explode?
During the Industrial Revolution Late 1700’s to 1900’s Extensive use of machines to increase production How does increased production cause population to increase?

What is over population?
number of people exceeds available resources

What is the Demographic Transition Model?
Complex line graph Categorizes a country based on birth & death rate Determines: Growth Standard of Living Level of industrialization

Demographic Transition Model

What are the levels or stages of development?
Don’t write this… just be aware of it. Researchers identify either four or five stages of development. The stages may be called different names by different people, but don’t get confused. They mean the same things. We will use five stages in this class.

Stage 1 Very high birth rates. Very high death rates.
Result: slow growth rates Pre-industrial, hunter/gatherer societies in remote areas.

Stage 2 Very high birth rates High death rates, but dropping quickly
Result: rapid growth rates Very low standard of living Found in poor countries in Africa, Caribbean, and Cen. America Least Developed Countries

Stage 3 Moderate to high birth rates Low death rates
Result: explosive growth rates Causes a large population increase, but standard of living remains low Mexico, S.E. Asia, and the Middle East Developing Countries and the Newly Industrialized Countries

Stage 4 Low birth rates Low death rates Result: slow growth rates
Population slowly increases, with a high standard of living Examples include the USA, Canada, Australia/NZ Developed Countries

Stage 5 Very low birth rates
Very low death rates… sometimes increasing Result: No growth, even population loss Population begins to shrink, usually has a high standard of living Examples include Russia, many E. European countries “Post – Developed Countries”

POPULATION PYRAMIDS

What type of graph is a Population Pyramid?
Complex Bar Graph What is shown? Males and Females by age Why? Demographers use age and sex to help predict info. about a country How do population pyramids work? wide base = high % of children Narrow base = low % of children

Making Predictions Quick Write #1
Look at the shape of these charts, and think about them. Then try to answer these questions on a separate paper. Which has a higher % of children? Which is most wealthy, most poor? Which has the most unemployed? Which probably has best health care? Which has most not going to school?

Projected U.S. Population Growth 1950-2050

Mexico Population Pyramid 1980- 2005

France Population Pyramid 1990-2015

Making Predictions – Quick Write #2
Which country is growing the fastest? Are any of the countries populations going to shrink? Which country has the least amount of people below the poverty line? Which country would a couple be most likely to have no children, 2 kids, 6 kids? Which country has the greatest % of doctors, least?

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