Population Explosion
The sudden rapid increase of the population. It happened in the Industrial Revolution in the 1960’s
Birth Rate
The number of children born per 1000 of population. This is because of better medical care, food, living conditions, less social stigma (in some areas)
Death Rate
The number of people who die per 1000 of the population per year. This has reduced due to medical care, education, support systems, and clean water.
Natural Increase
When birthrate is higher than the deathrate.
Natural Decrease
When deathrate is higher than the birthrate.
Infant Mortality
The number of children under the age of 1 who die per 1000 of the population, per year.
The movement of people. It can increase the population of a country, but will not change world population.
Life Expectancy
The number of years that one is supposed to live to, at the time of birth.
Carrying Capacity
The number of humans and animals a land area can support.
Over Population
Too many people for resources.
Under Population
Too few people to fully utilise the resources.
Optimum Population
When resources and population are in balance.
Population Structure
Shows how the population of an area is divided up between males and females of different age groups.
Population Pyramids
Used to show population structure.
Dependant Age
Children under 15 and adults above 65
Working Age
15-64 years old
Dependency Ratio
The number of people dependent on the working population.
How to Calculate the Dependency Ratio
(% of population age 0-14) +( % of population aged 65) ? (% of population aged 15-65)
Aging Population
When the average use of the population gets greater than the number of over 65’s.
The Demographic Transition Model
A geographical model used to explain the process of change from high birth and high death rate to low birth rates and low death rates as part of the economic development of a country from a pre-industrial to an industrialized economy.
Population Density
The average number of people per square km.
How to calculate Population Density
Total population ? Total land area in km squared
Population Distribution
Where people are measured by comparing density.
Chloropleth Map
Shows population density on a map by shading.
Migration Balance
Looking at the number of people moving into a place, and out of a place.
Types of Migration
Internal, International, Forced, Voluntary, Long Term, Short Term, Seasonal.
Internal Migration
Moving within a country.
International Migration
Moving to another country.
Forced Migration
For human or nature reasons.
Voluntary Migration
When you choose to move.
Long Term Migration
Moving for a long time.
Short Term Migration
Moving for a short amount of time.
Seasonal Migration
When you move with the seasons, moving for needs depending on what the season offers.

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