how and why does the distribution of population change overtime? population change

HOW AND WHY DOES THE DISTRIBUTION OF POPULATION CHANGE OVERTIME?

POPULATION CHANGE

CONNECTOR

• Open your books to your homelearning• Swap books• Mark each others work out of 4 marks

• How are the two graphs you collected different or similar form each other?

BY THE END OF THE LESSON:

• By the end of the lesson we will have:

• All pupils will have written a definition of the key term terms

• All pupils will have understood and annotated a DTM

• All pupils will have completed a living graph

HOMELEARNING

Draw two separate spider diagrams .For both birth rate and death rate, write down the causes/factors for an increase and decrease of both.

Reasons for increase and

decrease in birth rates

Increase of birthsdue to a lack of contraception

No matter where you are in the world, population change (growth and decline) is produced by 2 processesNatural changeandMigration

We will be concentrating on natural change

WHAT DO THE FOLLOWING TERMS MEAN?

Birth rate

Death rate

BIRTH RATE

• What does it mean?

• The birth rate is number of babies born per thousand people.

DEATH RATE

• What is the death rate?

• The death rate is the number of people who die per thousand people.

NATURAL POPULATION

What is natural population?

It is the difference between birth rate and death rate.It does not include migration (movement of people)

NATURAL POPULATION INCREASE

• The natural increase is birth rate minus the death rate.

• If the birth rate was 15 and the death rate was 3, what would the Natural Increase be?

• Birth rate = 12; Death rate = 12: NI = ?• Birth rate = 8; Death rate = 9: NI = ?

• So why would a population decrease?

LOOK AT THE FOLLOWING SHEET

Complete task one individually

With the person sitting next to you; compare your ticks.

THE DEVELOPMENT OF A COUNTRY INFLUENCES IT POPULATION GROWTH

• It has been observed that countries develop and, as a result, so too does the rate of natural change.

• Theses changes underlie a generalisation known as the ‘demographic transition model’. It suggests that countries pass through 5 different phases.

ON A THE OUTLINE THE GRAPH

Copy the BR, DR and population.

Use three different colours and create a key to start with.

For each stage of the transition model can you explain why population is changing

For each stage; write down country that might be in this stage.

THE DEMOGRAPHIC TRANSITIONAL MODEL

WHY ARE THE BIRTH AND DEATH RATES FLUCTUATING?

Birth rate

Death rate

Population

WHY MIGHT THE DEATH RATE BE FALLING?

WHAT WOULD CAUSE THE BIRTH RATE TO FALL?

WHY DO THE BIRTH AND DEATH RATES LEVEL OUT?

CUT OUT THE STATEMENTS

In groups of 3 or 4 decide where the best place for each statement is.You will be expected to justify your choice using the key terminology in your explanationBirth rateDeath rate Population changeNatural increase/decrease

BUT BEFORE YOU START LOOK AT THE FOLLOWING STATEMENT

Jack has realised that there is not enough farmland in his home village for everyone to grow the food they need. He wants to leave and take his wife and 5 children to another country where there are fewer people and more land available for farming. • 

EXPLANATION

This is because of changes in the (Birth Rate / Death Rate / Total Population ) so will happen at stage (A, B, C, D ). There is now not enough farmland for all the people in the village because the (Birth Rate / Death Rate / Total Population ) is now much (higher / lower), so there are too many/ few people living in the area now.

YOU NOW NEED TO CHOOSE 2 STATEMENTS AND EXPLAIN WHERE

THEY SHOULD GO.

Activity – card sort

• In pairs, separate the cards into 4 piles, one for each stage.

• Copy them into your books underneath the correct stage of the Demographic Transition Model

• Decide which stage the general description is referring to and put it in the correct column.

Activity – card sort

• In pairs, separate the cards into 4 piles, one for each stage.

• Copy them into your books underneath the correct stage of the Demographic Transition Model

• Decide which stage the general description is referring to and put it in the correct column.

TASK

• Select two countries (1 MEDC and 1 LEDC) from your data table (from last lesson) which have not been mentioned today.

• Describe and explain what stage they are in.

MODEL ANSWER - SEE

STATEMENTThe UK is in stage 4 of the Demographic Transition Model. It has both a low death rate of 9 and a steady birth rate of 13 which makes the rate of natural increase small, at only 0.3%

EXPLAINATIONThe low death rate is due to good heath care and good quality of life. There is no need for large families and infant mortality is low, so the birth rate is relatively low.

ELABORATIONThis means the population growth is quite small and steady, although it can fluctuate because of wars or pandemics.

Review – Quick-fire Quiz

• How many stages are there in the DTM?• What are the three lines on a DTM?• Which stages are the following countries

currently in:Cuba, Sri Lanka, China, UK, Ethiopia?

• Why are there problems with the DTM?

REST OF SLIDES ARE FOR INFORMATION

STAGE 1

• Britain and Europe were like this before 1750 (before industrialization), and some parts of the poorest countries are at this stage now.

STAGE 2

• Britain was in this stage towards the end of the 19th century, and countries like Sri Lanka have these characteristics today.

STAGE 3

• Britain was like this in the first half of the 20th century, and developing countries like China and Cuba are in this position today.

STAGE 4

• Much of Europe was in this stage after 1940, along with Japan, the USA and, now, other developed countries.