Population dynamics.g.p mhlawuli
Published on: Mar 4, 2016
Transcripts - Population dynamics.g.p mhlawuli
LESSON NUMBER 7BYG.P MHLAWULI17 APRIL 2013Geography Grade 11
PopulationIt refers to the collection ofindividuals in an area.
continuationWords to know in the chapter:Migration-movement of people fromone place to another.Immigration-Moving into to live) anarea or country.
ContinuationNatural Change-net change in totalpopulation of an area due to the balance ofbirth rates and the death rates.Migration Change-Net change in the totalof a population at an area due to migration.Emigration-moving out of an area orcountry to live in a new one.
Dynamics of Population Growth Births, and Deaths have effect on thegrowth and decline of a population.There are 3 forces representing abalance in any population on the earthsurface. Referred to as the populationdynamics.
Population DynamicsoCrude Birth Rate-which is thenumber of births over a period oftime divided by an averagepopulation.oCrude Death Rate-Is the numberof deaths per unit of time dividedby the average of population.
continuation Crude Growth Rate- Describes thedifference between the number of birthsand the deaths per units of time. They are referred to as Crude because theyfail to take into account the factors such asAge and Gender of the members of thepopulation.
Diagram illustrating how the dynamics relateto keep a balance in an area.
Picture Analysis Having studied the pictures above you didget an understanding of how each factorcontributes in keeping the population in abalance state. Now let us discuss step bystep.To make it more simple we take the wholebox as a area (community)with its totalpopulation (residence).
ContinuationThe box is divided into 2 parts thenatural(left side) and migration(right side), which are changes thatoccur in a community and affect thepopulation.There are incoming arrows showingbirths and
continuation immigrants, they show an inflow inthe population which results inpopulation increase in the community.The out going arrows above death andemigrants indicate an outflow in thepopulation which leads to a decrease inthe population of the community.
Why we experience these changes inpopulation (community)?Immigration-could occur because thearea has enough food and security thanother area.Birth- Parents can afford the baby, orpeople do not have access to familyplanning.
ContinuationDeath-Natural causes like aging, or poorservices and equipments in hospitals.Emigration-occurs when there is lack ofresources, food in an area, might due to overpopulation. People live the place to a moreresourced area.
Study the pictures below (what comes tomind?)
Class Discussiono Having looked at the pictures above .o Tell me which areas would youlike/prefer to live in.o Discuss what you think is happening tothe population in each of thecommunities.o Name factors/changes that you thinkare affecting each communities.
Reference1.Focus on Geography by G. Keats – 20072. Middle School Geography Curt L. Anderson, BonnieT. Meszaros, Mary Lynn Reiser – 20043. Introduction to Population by Dick Neal – 2003
Announcement Answer the questions on http://goo.gl/BZuOJ totest your understanding