Population change Flashcards
What does exponential growth mean?
Rapid, year on year population growth.
Birth rate is?
The number of live births per 1000 of the population per year.
Death rate is?
The number of deaths per 1000 of the population per year.
Natural increase is?
Where the birth rate is higher than the death rate.
Natural decrease is?
Where the birth rate is lower than the death rate.
How do you work out the annual population change?
The birth rate minus the death rate plus or minus migration.
What is the name given to a graph that shows an exponential rise?
‘J shape’ graph
The name given to a graph that shows exponential growth slowing and levelling off is?
‘S shape’ Graph
Migration is?
The movement of people either into or out of an area.
What is emigration?
The movement of people out of an area
Immigration means?
The movement of people into an area
What is the Demographic transition model?
A graph that shows how countries pass through different stages of population growth over time.
The DTM shows changes in birth rate, death rate and natural population.
There are 5 stages. Progression through each stage is associated with economic development (i.e. Afghanistan in stage 2 is at a lesser stage of development than France in stage 5).
What is population structure?
The composition of the countries population by age and sex.
A census is?
Population data including age, sex and occupation.
Population pyramid is?
A graph that shows the population structure of a country.
Horizontal bars are used to show actual numbers of males and females in each five year age group (0-4, 5-9 ect). They give a good visual impression of a country’s population structure as it progresses through the DTM.
What is an apex and what does it show?
The tip of a population pyramid. A high apex show long life expectancy.
What is a base and what does it show?
The bottom of the population pyramid. A wide base shows high birth rate.
What is the name given to the population structure of a country in stage 1 or 2?
‘funnel shape’
What is the name given to the population structure of a country in stage 3 or 4?
‘Rectangular shape’