Physical and political map of America

Political map of America.

Physical map of America.

Physical and political map of Asia

Physical map of Asia

 Political map of Asia.

Population density .

 

The density of population estimates the number of inhabitants between the surface of the site. In general it is considered that an area is sparsely populated has a density of 10 inha./km2.  And that is a very populated area if the density exceeds 80 inha./km2.

Model of population cycle.

The model of demographic transition progresses in four stages:Old or preindustrial demographic regime: it is characterized by high mortality rates and birth rates.First transition: Keep the high birth rate, but mortality drops.Second transition: the birth rate begins to decline, but mortality is still down more slowly.Modern demographic regime: Mortality rates and very low birth.

Population world map.

How as the population evolves?We study:The birth rate: is the number of births

Fertility: the estimate of children a woman would have throughout his life

Mortality: The number of deathsTo know the real crecimento a population we have the migration.

The population can be:

 Activa :(16 - 64 years): the employed and who are unemployed.Inactive: Those who can not work due to sickness and students.

Map of natural increase of world population .

Causes of Birth:
 As the economyVirilityThe acess married women into the labor marketThe ingnorancia (thought: Our children are going to die young mui)Psychological causes
  CelivatoAccording to the policyCan be prenatal (encourage them to have children) or anti-natalist (amim not to have children).

Spanish population Pyramid .