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Population
Question | Answer |
---|---|
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 |
Health |