Human Population Flashcards
Demography includes
Age
Income
Ethnicity
Education
Demography
Branch of sociology. Studies characteristics of human population.
Population density
Is the number of individuals of a species per unit area at a given time.
-(important to know)different environments can sustain different population densities.
Populations are controlled by two factors
Birth rate
Death rate
What is birth rate?
Rate at which individuals produce off spring (based on fertility rates)
What is death rate
Rate at which individuals die
Carrying capacity
Earth can only support so many people before it reaches its carrying capacity
Geometric rate
1,2,4,8,17,32
If population is left unchecked will increase at a geometric rate
Linear rate
1,2,3,4,5
If pop uncheck food supply will grow at a linear rate
The population is checked through
Natural processes
Positive checks
Increase death rate
Positive checks include:
Disease
Famine
War
Preventative checks
Lowers birth rate
Preventative checks include:
Abortion
Birth control
Celibacy
What is Carrying Capacity
Maximum population that can be maintained w/0 degradation of natural systems.
What is doubling time
Amount of time for a population to double
-can be estimated according to the rule of 70
Doubling time formula
70/growth rate(%)
70/2%=35years
Invention of agriculture & domestication of animals
10,000 BC - 5million
First millennium
300 million
When did the population cross 1billion mark
1800= first billion mark
How many years did it take for pop to grow to 1billion
33yrs
Agriculture
Advances in medicine
Every population issue is a result of
Over population
