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What (who) is population pyramid - definition
Population pyramid
![Africa]], and to a lesser extent for West Asia, South Asia, Southeast Asia and Central America.](https://commons.wikimedia.org/wiki/Special:FilePath/2017 world map, median age by country.svg?width=200 "Africa]], and to a lesser extent for West Asia, South Asia, Southeast Asia and Central America.")
![Map of countries by fertility rate (2020), according to the [[Population Reference Bureau]]](https://commons.wikimedia.org/wiki/Special:FilePath/Total Fertility Rate Map by Country.svg?width=200 "Map of countries by fertility rate (2020), according to the [[Population Reference Bureau]]")
![Population pyramid of [[Egypt]] in 2005. Many of those 30 and younger are educated citizens who are experiencing difficulty finding work.](https://commons.wikimedia.org/wiki/Special:FilePath/Egypt population pyramid 2005.svg?width=200 "Population pyramid of [[Egypt]] in 2005. Many of those 30 and younger are educated citizens who are experiencing difficulty finding work.")
![Nearly half of [[Libya]]'s 2011 population consists of people younger than age 20.](https://commons.wikimedia.org/wiki/Special:FilePath/LibyaPopulation2011.jpg?width=200 "Nearly half of [[Libya]]'s 2011 population consists of people younger than age 20.")
GRAPHICAL ILLUSTRATION SHOWING DISTRIBUTION OF AGE GROUPS IN A POPULATION
Age Distribution; Population Pyramid; Median age; Youth Bulge; Youth bulge; Christmas tree graph; Age structure diagram; Age pyramid; Age structure; Age-sex pyramid; Age distribution
A population pyramid (age structure diagram) or "age-sex pyramid" is a graphical illustration of the distribution of a population (typically that of a country or region of the world) by age groups and sex; it typically takes the shape of a pyramid when the population is growing. Males are usually shown on the left and females on the right, and they may be measured in absolute numbers or as a percentage of the total population.
Ecological pyramid
GRAPHICAL REPRESENTATION DESIGNED TO SHOW THE BIOMASS OR BIOMASS PRODUCTIVITY AT EACH TROPHIC LEVEL IN A GIVEN ECOSYSTEM
Biomass pyramid; Energy pyramid; Trophic pyramid; Pyramid of numbers; Pyramid of biomass; Ecological pyramids; Pyramid of energy; Food pyramid (food chain)
An ecological pyramid (also trophic pyramid, Eltonian pyramid, energy pyramid, or sometimes food pyramid) is a graphical representation designed to show the biomass or bioproductivity at each trophic level in a given ecosystem.
The Pyramid (Antarctica)
ANTARCTICA MOUNTAIN
Trough Lake; Pyramid Pond; Pyramid Trough; Pyramid Ponds
The Pyramid () is a small but distinctive peak of Omak just south of Pyramid Trough, at the west side of the Koettlitz Glacier. The descriptive name appears to have been first used by the British Antarctic Expedition of 1910–1913.
Examples of use of population pyramid
1. For centuries, Asia‘s population pyramid looked static, a vast base of young people supporting a sliver of elderly.