Population Notes

Demographics

Birthrate- number of live births per 1000

people Ex. 54/100 in Niger, 8/1000 in Latvia, 22/1000

in world Fertility rate- average number of children a

woman of childbearing years would have in her lifetime if she had them at the current rate for her country 2.1 replaces population, 3.0 is average in world

Death rate- aka mortality rate, number of deaths per 1000 Low rate means a healthy population

Important Terms

Infant mortality: the number of deaths

among infants under the age of 1 per 1000 live births high IM rate usually means poor

healthcare Rate of natural increase: population

growth rate Mortality rate – Birth rate = Rate of

natural increase Population pyramid: device showing

sex and age distribution of a population

More terms

Population Pyramid

• The PYRAMID on the left shows rapid growth

• The BOX shaped one in the middle shows slow growth

• The CUP shaped one on the right shows negative growth

2/3 of world’s population

lives between 20N and 60N Suitable climate and enough

moisture for agriculture ½ world’s population lives in

rural areas ½ world’s pop. lives in urban

areas (cities) There are 20 megacities

Megacity- city with a population of more than 10 million

Population Distribution

Population density: # of people/mi2 or # of

people/km2 Low density examples: Alaska 1 people/mi2,

Mongolia 6 people/mi2

High density examples: New Jersey 1,098 ppl/mi2, Singapore 16,714 ppl/mi2

Carrying capacity: number of organisms a piece of land can support based on resources, space etc.

Population Density