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Population

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by

Miss Cummins

on 15 March 2016

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Transcript of Population

Population
Factors that influence the rate of population
Over the course of history, population figures increased and decreased at various times
Population of the world today?
Over 7 billion
http://www.bbc.com/news/world-15391515
This is called fluctuation
Three main causes of population change:
1. Births
2. Deaths
3. Migration
Calculating Population Change
Birth Rates Death Rates
This is the number of babies born per 1,000 people in the total population in one year
This is the number of deaths per 1,000 people in the total population in one year
If more people are born than die in a year -->
Population grows
This is called a natural increase
If there are more deaths than births in a year -->
Population drops
This is called a natural decrease
Population increase/decrease is measured in
1000
's
We calculate these changes using
percentages

Example:
Birth
rate in Ireland in 2007 was
17 per 1000
of the population. The
death
rate was
6 per 1000
. How do you think we might calculate the natural
increase
?
17 - 6 = 11 per 1,000

Solution
11 x 100 = 1.1%
1000 1
Question
: If the birth rate in France for 2011 was 13 per 1,000 and the death rate was 9 per 1,000, what was the natural increase for that year?
13 - 9 = 4 per 1,000

4 x 100 = 0.4%
1000 1
Demographic Transition Model (Population Cycle)
People who study the changes in populations are called . . .
demographers
There are five stages to the population cycle:
Stage 1 :
High
Fluctuating Stage
The stage where a country is
underdeveloped

Total population is
low

BUT
it is balanced due to high death rates
canceling
out the high birth rates
Stage 2 :
Early
Expanding Stage
Country
begins
to develop
Total population
rises
Death
rates
fall
due to developments and improvements in food supply, health care and
sanitation

Birth rates
remain high
Mali
is in this stage
Stage 3 :
Late Expanding
Stage
Country is
developing

well
Total population
still rising
Natural increase in
high
Brazil
is in this stage
Gap between birth and death rates
narrows
due to
family planning
Fewer children are needed to work
Stage Four :
Low Fluctuating
Stage
Country has become a
developed
country
Total population is
high
Smaller
families
Ireland
is in this stage
Low birth rate
AND
low death rate
Most people live to
old age
Stage Five :
Senile
Stage
Total population is high
BUT
it is going into
decline
due to an
ageing
population
Continued desire for smaller families
Woman often opt to have children
later
on in life

Germany
is in this stage
Food supply
War
Technology
Health
Education
Women in society
Food supply
Growing population needs an increased food supply
Agricultural Revolution
lead to an increase in population
Machinery
and new
farming methods
allowed farmers to produce more food
What are
examples
of these farming methods?
Crop Rotation
Selective breeding
Fertilisers
and
Pesticides
allow farmers to grow more crops




This also reduces the chance of famine
This lowers the death rate and population grows
War
Increases death rate
Decreases birth rate . . . how?
Young people are usually in the war
War puts a strain on :
Health services
Water supplies
Sanitation
Farming
Population in
Germany
decreased during WWI and WWII
However, when soldiers returned there was a baby boom


Many parts of
Africa
and the Middle East are torn at present which affects the population in these countries
What war is going on as we speak?
Syrian War
Population:
2013 - 22.85 million
2014/15/16 - 17.07 million . . .
Began in 2011
Technological development
Increase in food supply
Tractors
and
machinery
have advanced
Irrigation
systems provide much needed water to grow crops in areas of drought
Technology has also improved people's
health


Medical
equipment and new
drugs
mean people are living
longer
This all
reduces
death rates and causes population to grow
Health
Good health care
lowers
death rates
What essential medical help is available to people in developed that is
not
available in developing countries?
The availability of
vaccines
and
antibiotics
means that people in developed countries can
survive
illness

In developing countries the same illnesses would cause
widespread death
What can reduce the spread of disease ?
Availability of clean drinking water
Proper sanitation
Education
Medical intervention
Education
Healthier
diet
Personal
hygiene
Sanitation

This leads to lower birth rates and lower death rates
Once people are educated they often opt for
smaller
families - family planning
Millennium Development Goals
Over
6 million children
in the world are at the primary school-going age are not attending school
Over half of these are in
Sub-Saharan Africa
Education is needed to reduce
poverty
and to combat
AIDS
and other diseases
The Place of Women in Society
Ireland - many women work outside the home and they plan their families
Less developed countries - women get married very very young and have many children
HUGE influence on population change
Women play different roles in different countries
More women educated
=
more inequality
=
smaller families
=
birth rate drops
=
better life
Full transcript