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Demography Study of population change
Population explosion Rapid growth of population in the twentieth century
Birth rate Number of births per 1000 ppl per year
Death rate Number of deaths per 1000 ppl per year
Natural increase When the birth rate is higher than the death rate
Natural decrease When the death rate is higher than the birth rate
Calculation of population change Birth rate - death rate over 1000 multiplied by 100
Population distribution Refers to how ppl are dispersed around the world or in any given area
Population density Average number of ppl living in a square kilometre
Calculating population density Population dived by area of land
High density problems Overcrowding, pollution, shortage of clean water, lack of open space
Low density problems Low marriage rates, abandonment of agricultural land, political or economical isolation
D.T.M stage 1 High fluctuating stage- high birth and death rate
D.T.M stage 2 Early expanding stage- death rate declines rapidly, birth rate declines slowly
D.T.M stage 3 Late expanding stage- death rate falls more slowly, birth rate falls quicker
D.T.M stage 4 Low fluctuating stage- birth rate continues to fall slowly, death rate is steady
D.T.M stage 5 Senile stage- low birth no death rate
Food supply Increases-health increases-people live longer-decrees death rate Decreases-health declines-population declines-famine,drought
War Population is reduced directly when soldiers and civilians die Interrupts fam life, couples separated, reduction in birth rates Disrupt daily life e.g agriculture, water supply,sanitation-affect health,death
Technological developments Green revolution in Europe: inventions have increased farm productivity e.g improved ploughs,tractors,threshing machines,combine harvesters,irrigation
Created by: Orlaf



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