Population and migration Flashcards
What is a population
Total number of humans alive on earth at a given time
Why is the population growing
Developing countries have higher birth rates
Death rates have fallen in developed countries due to improved health care and medicines
More countries are now economically sound and developed
What is meant by birth rate
Number of babies born in a country per year
What is meant by death rate
Number of deaths per country per year
Birth and death rates are measure per how many people of the population
Per 1000
To calculate the natural increase in population what do you need to do
Birth rate - death rate
If the value for natural increase is negative what does this mean?
There are more deaths than births - the size of populations is decreasing
If the value of natural increase is positive what does this mean
There are more births than deaths and population is increasing
What are some features of a well developed country
Low birth rate
Low death rate
Small natural increase
What are some features of less developed country
High birth rate
High death rate
Large natural increase
What is population density
Measure of how many people live in a set area
How calculate population density
Number of people/ area (km2)
If have a high population density what does that mean
Lots of people in an area eg cities such as New York
If have low population density what does it mean
Few people - sparsely populated eg Australia outback, Amazon rainforest, desert
What is a chloropleth map
A map that is shaded used to show data eg population densities
