The natural movements of the population

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The natural movements of the population

  1. 1. The natural movements of the populationThe changes produced by biological factors receive the name of natural movements Natural Natality Mortality Increase
  2. 2. The Birth rate It is calculated by dividing the number of births a year in a place by total population ; the result is multiplied by one thousand. Remember, it is expressed in so many people per thousand TN = number of births a year total population * 1000If one country with a population of 100.000 inhabitants had been born2000 children . Which will be the birth rate?TN= 2000 100.000 * 1000 = 20 %0 Remember per thousand
  3. 3. Birth rate map
  4. 4. The fecundity rate It measures the number of children per woman in fertile age (15-49 years) . In order toGeneral fecundity rate is guarantee the maintenance of thecalculated by dividing the population we need a figure ofnumber of babies that are about twoborn alive in one year bythe number of women infertile age There are 20.000 women in fertile age and this year has been born 150 children . Calculate the fecundity rate . GFR= 150 20.0000 *1000 = 1, 5 %0 Will the maintenance of the population be guaranteed or not ?
  5. 5. Mortality or death rate It is the number of deaths a year in a population . It is calculated by dividing the number of deaths a year in a place by its total population ; the result is multiplied by thousand There are 1.000 deaths in a country and there , there are 30.000 people . Calculate this death rate DR= 1000 30.000 *1000 = 33.3 %0
  6. 6. Think: Why the Spanish death rate is higher than Chinese death rate?Explain it !!!!
  7. 7. Infant mortality rate It indicates the number of deaths of babies under one year of age per 1,000 live births. The rate in a given region, therefore, is the total number of newborns dying under one year of age divided by the total number of live births during the year, then all multiplied by 1,000. The infant mortality rate is also called the infant death rate (per 1,000 live births).There are 28 dead children and 1.750 live births . Calculate thisinfant mortality rate IMI= 28 1.750 * 1000 = 16 %0
  8. 8. Explain this map!!!!
  9. 9. Life expectancy It is the average number of years that a newborn child is thought to live . It is higher in the rich countries
  10. 10. Natural increase It is the existing difference between the number of births and deaths in a population at given time. RNI= BR-DR It is positive when the figure of births is higher than figure of deaths and it is negative the other way round

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