Population Summary

  • Created by: mili.v
  • Created on: 07-09-18 19:05


Why is there more people now than in 1990? (population explosion)

  • improved medical care (vaccinations, hospitals, doctors, new drugs and scientific inventions)
  • improved sanitation and water supply
  • improvements in food production (quality + quantity)
  • improved transport means (for moving food, doctors, etc.)
  • decrease in child mortality

There are too basic types of population used to describe how many people live in a country. These are:

1. Under-population 

when a country has declined too much that it can't support its economic system. 

  • shortage of workers
  • less paying taxes
  • schools, hospitals and transport routes are close due to there being few customers
  • less inovation/ development
  • hard to defend
  • have to attract migrants

2. Overpopulation

when a country has too much population that it can hardly support it

(overcrowding, depletion of resources)

  • unemployment (too much that the amount of jobs aren't enough)
  • shortage of hospitals/ schools (not enough for everyone)
  • shortage of housing (there may be a lot of people living in a small place because of this)
  • congestion
  • inflation (excess demand)
  • shortage of water and electricity
  • noise, air and water poullution

The population size is related to the amount of resources available (such as water, wood and minerals). But, what causes the population to change in size?

  • migration = movement of people (or animals) from one country to another
  • the more immigrants, the more people a place will have. This will cause an increase in demand as there are more people who need certain goods or services.
  • birth rate = average number of live births in a year for each 1000 people
  • higher birth rate means that  more people are born, which increases the number of people a country has.
  • death rate = average number of deaths every 1000 people per year
  • high death rate means that there's a decrease in population.
  • fertility rate = average number of children a female is expected to have in their life time
  • if a country has high fertility then there's an increase of population

Which are the main causes of change in population size?

  • carrying capacity = number of people the enviroment can support without there being negative effects to the population.
  • optimum population = number of people that…


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