Bell work 10-11-11The 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 STRUCTUREThe population pyramid displays the age

and gender structure of a country or given area

Population inFive Year

Age bands

Usually, but not always,Given in a percentage to make for easier

comparisonsbetween countries

FEMALESTo the rightMALES

To the left

Population pyramid of a less developed nation

Population Pyramid of Nigeria (1995)

Interpret a Population Pyramids

A TRIANGLE SHAPED 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 PyramidsA DIAMOND SHAPED POPULATION

PYRAMID MEANS:

•BIRTH RATE IS LOW AND 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

let’s practice drawing one together.

Age Male Female0-19 15 14

20-39 16 16

40-59 12 12

60 & Over 7 9

Australia

Compare Schofield Barracks, Hawaii to Bella Vista, Arkansas. What are some potential reasons that might

cause the ages to be distributed in this way?

World War I 1914-1918 1.7 million military dead

December 1934

Stalin began a period of purging and terror that lasted until 1939

and was marked by the execution of virtually the entire

political and military elite.

How old do you assume these people would have been in

1939?

Soviet Union

Soviet Union

• How would you determine how World War I impacted the male population?

• What age group was impacted by Stalin’s purges?

Homework

• 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 diamond and triangle shaped pyramids.