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Sandra Cleveland

on 23 July 2014

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Transcript of POPULATION

More than 7 billion now live on the earth and that number is growing rapidly.
What factors lead people to live where they do?
Population Density
Patterns of Settlement
Population Growth
*1 million seconds is
equal to 11.6 days

*1 billion seconds is
equal to 31.7 years
*One birth every 8 seconds

*One death every 12 seconds

*One international migrant (net) every
40 seconds

*Net gain of one person
every 17
More than 2/3 of the earth is covered in water.
About 1/2 of the land area is almost unlivable because of harsh deserts, rugged mountains, or bitter cold climates.
As a result, almost all people live on a relatively small share of the earth's surface - areas where the soil is fertile enough, water is plentiful enough, and the climate mild enough to grow crops.
People have adapted their way of life in response to the surrounding environment and adapted the surrounding environment to their way of life.
Population Density
= the average number of people in a given unit of land, typically a square mile or a square kilometer
Arithmetic Population Density
The population of a country or region expressed as an average per unit area.

Total Population
________________ = APD
Total Land Area
Physiologic Population Density
the number of people per unit of arable land.

Total Population
_____________________________ = PPD
Total Land that can be Farmed
Population density maps like this are called
. The size of a country is depicted relative to the population of that country. The larger the population, the larger the size of the country in comparison to other countries.
Agricultural Density
the ratio of the number of farmers to the amount of arable land
description of
location on Earth's
surface where
population lives.
Population Clusters
Two-thirds of the world's population are concentrated in four regions:
1. East Asia (East China, Japan,
South Korea, Taiwan)
2. South Asia (India, Pakistan,
-bound by the Himalayas and a
desert in Pakistan and ocean
to the South.
3. Europe
-population is concentrated
in cities
4. North America

Dot Maps
Maps where one dot represents a certain number of phenomenon such as population.
A periodic and official count of a country's population.
The term used to refer to large urban agglomerations
Population explosion
- the rapid growth of the world's human population (past 2 centuries) attended by even shorter doubling rates and accelerated rates of increase.
Too Many...Too Fast
Doubling times
- the time required for a population to double in size
Natural Increase Rate
the difference between the number of births and the number of deaths
Crude Birth Rate
the number of live births per year per thousand people in population
Crude Death Rate
the number of deaths per year per thousand people in population
95% of Global NIR is taking place in Lower Development Countries in areas such as Sub-Saharan Africa and South Asia.
Total Fertility Rate
Average number of children a
woman will have during her child-bearing years (15-49 yrs of age)
**Natural Increase Rate, Crude Birth Rate,
and Total Fertility Rate will almost
always mirror each other**
Population Trends
Population Pyramid
a graphic illustration that shows the distribution of various age groups in a population.
There are three population indicators that are taken into account for the various stages of a population pyramid.
the expected number of years of life remaining at a given age.
Because life expectancy is an average, a particular person may well die many years before or after their "expected" survival.
A system of pastoral farming in which ranchers move livestock according to the seasonal availability of pastures.
Migrants who cross borders to a new location in search of work
Military Service
Moving to a new location due to service relocation
Types of Migration
& Internal Migration
Movement of location inside a country's borders, or moving from one country to another.
Moving of one's own free will, after observing and analyzing the choices, then choosing to migrate.
Conditions which successfully attract migrants to a location
Conditions which help a migrant decide to leave a place
Migration that is imposed by
authorities and leaves the migrant no choice
Full transcript