Transcript Population pyramids

Another way to analyze population growth
The political cartoon depicts population
growth over the past two thousand
years.
Which statement best describes this
illustration?
a. Human population has decreased
gradually since 1800.
b. Human population has increased
gradually since 1800.
c. Human population has decreased
rapidly since 1800.
d. Human population has increased
rapidly since 1800.
D is the correct answer.
Explain why?
Essential Question
•How do you interpret
a population
pyramid?(7.3.21)
What percentage of the population do you
represent in this graph?
What is a population Pyramid?
A visual representation of the population of
a country.
• It is a graph that displays a population's
age and gender composition
• show numbers or proportions of males
and females in each age group
• reflects a country’s birthrate and death
rate
• reflects population growth or decline
POPULATION STRUCTURE
The population pyramid displays the age
and gender structure of a country or given area
Population in
Five Year
Age bands
MALES
To the left
FEMALES
To the right
Usually, but not always,
Given in a percentage to make for easier
comparisons
between countries
Population pyramid of a less developed nation
Population Pyramid of Nigeria (1995)
Interpret a Population Pyramids
A TRIANGLE SHAPED (Christmas Tree) POPULATION
PYRAMID MEANS:
•Birth rate is high and Death rate is high
• high Infant mortality rate
•Low Gross Domestic Product
•Low quality of life, such as little medical care,
inadequate food supply or poor water quality.
Population pyramid of a developed nation
Population Pyramid of Sweden (1995)
Interpret a Population Pyramids
The Box POPULATION PYRAMID MEANS:
•Birth Rate Is Low, but still growing
•Death Rate Is Low
•Low infant mortality rate
•High GDP
•High quality of life, such as access to health care,
plentiful food supply and good water quality
Population pyramid of a developed nation –
zero growth/declining population
Population Pyramid of Japan (2000)
Interpret a Population Pyramids
The Cup POPULATION PYRAMID MEANS:
•Birth Rate is not only low, but shrinking
•Death Rate is Low
•Low infant mortality rate
•High GDP
•High quality of life, such as access to health care,
plentiful food supply and good water quality
Population Growth Trends
Reflection
• Marvin the Martian just received a
population pyramid, but he does not know
how to read it. In a letter, explain to
Marvin how to interpret a population
pyramid.
• Please include the basic components of a
pyramid and the difference in the three
pyramid shapes.