How quickly is our global population growing and why?

Birth rate means how many babies are born each year.

Death rate means how many people die each year.

Natural increase is the difference between how many babies are born and how many are dying.

Formula:

DR-BR=NI

DR=Death Rate

BR=Birth rate

NI=Natural Increase

The humans population grows each year because there is a high birth rate compared to death rates.

The Demographic Transition Model:

The demographic transition model shows population change over time. It is divided into 4 or 5 stage, and the total population is different at each stage because of changing birth and death rates.

Migration is the movement of people moving from one place to another.

A migrant is a person who moves to another part of a country or a different country, often to work for a while.

Birth rate, death rate, migration- How do these affect the population?

They affect the population because if the birth rate is high then the population will increase however we will need more resources and they will be more pollution in the air. On the other hand, if the death rate is low then the population will still increase from the migrants moving there. Also the medication and education will encourage women to have children which will produce a high birth rate. Overall, the human population will keep on growing each year.

Population distribution

Population distribution is the term used to describe the pattern of where people live.

Population density

Population density is the term used to say how many people live in a certain area. e.g. 12km squared

Low population density

e.g. 2 km squared

High population density

e.g. 12km squared

Reason why:

Population density is low.........

Mountains- not many resources and harder to access
Poor quality housing
Poor quality schools
Not good medicine
Not enough resources
Rural area

Population density is high........

Urban area
High quality housing
Good schools
Good medicines
Lots of resources-nearby shops/markets

Dense-(high population density)

A good natural water supply nearby, such as rivers which can used for transportation, irrigation or hydroelectricity.

A maritime or continental climate-ideal for growing crops.

A coastal area- sea breezes, ports, harbours and beaches often make coastal areas a preferable place to be.

Sparse-(low population density)

A polar or desert climate- it is difficult to grow crops.

A mountainous region- difficult for transportation due to steep land,snow and ice.

Uk's population has grown over the past 2000 years

The graph line gradually shoot up near 1000-2000AD
Hunter gatherers live by hunting animals and gathering fruit and survival kit.

Timeline

Before 10,000 BC- hunter gatherers
Around 10,000 BC- We began to grow food and rear animals. The population began to rise.
About 3300BC - Stone Age/ stone for tools
Around 3300BC - Bronze Age/we discovered how to make bronze
About 1200BC - Iron age/ we learnt how to produce iron
farming methods and tool improved - population/ numbers grew faster
43AD - Romans invaded Britain/ world population about 200 million
Around 1760- Industrial Revolution/ population began to shoot up
Around 2012- Where will it all end/ Rise, rise, rise, rise ,rise, rise....

As the population grew towns, cities and places got bigger and bigger.

Population Pyramids:

There are two basic population pyramid shapes:

Population pyramid for a less economically developed country (LEDC)
Population pyramid for a more economically developed country (MEDC)

Key points on a population pyramid:

LEDC:

few old people - a low life expectancy
concave shape - a high death rate

MEDC:

large number of older people - long life expectancy
slightly more older women than men
steeper sides - lower death rate
narrow base - low birth rate

	Criado por Archanaa Baheerathan mais de 7 anos atrás

population/ global population