7 billion and counting Flashcards
Describe population growth since 1850
Gradual increase over 1850 - 1950 and then rapid increase.
What is the global polulation?
7 600 000 people
Why are places sparsely populated?
Poor conditions, (cold, hot)
Bad land for building
Why are places densely populated?
Free healthcare, Good conditions, Good for crops, flat land, Good job opportunities
Describe a underdeveloped countries population pyramid
Very wide a the bottom, Very narrow at the top. Not tall
Describe a developed countries population pyramid
Medium width at the base and fairly straight sides all the way up.
What are some problems with an ageing polpulation?
Less tax payers, Less economically active, they don’t earn money.
What are some pull factors that could cause migrations?
Better climate, better jobs, free healthcare, better schools
What are some push factors that could cause migrations?
Unemployment, War, famine, flood, segregation,
What are problems for Urbanization?
Disease, death, poor sanitation, overworked healthcare, unemployment, no housing
what is a demographic transition model?
The Demographic Transition Model is a simplified way of looking at how population is changing and has changed around the world.
What does natural increase mean?
The natural balance (or natural increase) is the difference between the number of births and the number of deaths recorded over a period
What does population explosion mean?
a sudden, large increase in the size of a population.
What does birth rate mean?
the number of live births per thousand of population per year.
What does death rate mean?
the ratio of deaths to the population of a particular area or during a particular period of time, usually calculated as the number of deaths per one thousand people per year.
