Population density
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Population density is a measurement of population size per unit land area. It is mostly applied to humans, but sometimes to other living organisms too. It is a key concept in population geography. In
Mongolian Steppes. Mongolia is the least densely populated country in the world due to its harsh climate as a result of its geography.
Monaco is currently the most densely populated nation in Europe.
Population pyramid
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A population pyramid or "age-sex pyramid" is a graphical illustration of the distribution of a population by age groups and sex; it typically takes the shape of a pyramid when the population is growin
World population pyramid from 1950 to projected in 2100 (UN, World Population Prospects 2017)
Nearly half of Libya's 2011 population consisted of people younger than age 20.