- 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:
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
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)
- 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…