Reading graphs

Compound line graphs :

• Used to show population change 

Choropleth map 

Scattergraph

Population density and distribution

Density - the number of people per square km.

(When describing a map use figures)

When describing patterns on maps you must - 

• OVERALL - is the data even or uneven 
• PATTERN - where are the maximum and minimum or different countries
• PLACE - give a location
• DATA - give figures for the patterns
• ANOMOLIES - are there any odd ones out

Write your descriptions in this order - OPPDA

Dependecy ratios

It tells us how many young people (under 1)  and older people (over 65)  depend on people of working age (1-64) i.e. the economically active 

The dependency ratio  =  (% under 15) + (%over 65)    X 100

                                                  % 16 - 64

Youthful Population

What are the problems associated with a youthful population?

Many children and fewer working adults. More schools needed to educate poopulation

One Child Polocy in China

Why was it needed?

• China was becoming over populated, a lack of food and drinking water

Why did they introduce it?

• Country would be over populated
• Famine, pollution, over cultivation, poverty, disease, homelessnes.

How did they introduce it?

• They told people, and if they didnt notify the goverment, you would have to pay large fines 

Problems

• Preference for boys lead to higher male population by 60 million
• 120 boys there are 100 girls
• An elderly population

Advantages

• Population growth has decreases for people to have enough food and jobs
• The population 1:230 million less than it should have been today

How has it changed recently?

• China has become more flexible allowing couples to have a second child if there first is a girl

Overpopulation and underpopulation

Overpopulation - There are too many people and not enough resources to support a satisfactory quality of life

What are the causes of overpopulation? 

• Decline in Death Rate
• Better Medical Facilities
• Immigration
• Lack of family planning
• Large families, trees being cut down and industry
• Optimum population…