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Population density Population density is the number of people in a given area (usually given as persons per sq. km.). To find this figure the total population is divided by the area. Density can be shown on a choropleth map which shows the average density across regions. This is easy to read but disguises major population concentrations.

Any AP Human Geo teachers, this site is GREAT for examples from all 50 US states for Population Pyramids....

World Population Pyramids of the World: 1950-205

Quiz-Busters Games Directoryinteractive quizzes by subject and key stage

This constantly updated world clock will give you statistics on world population, number of deaths, illness and injury incidences, the environment and natural resources, energy sources, US crimes and punishments, food production and animal slaughter and more.

More than 100 science academies around the world have called on world leaders to take action on population and consumption at the Rio+20 summit. They say past failures on these issues threaten the natural world and prospects for future generations. The science academies include the UK's Royal Society as well as its peers in countries at all stages of development.