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.

Synoptic chart of th Spanish political system.

Synoptic chart of teterritorial organization of state

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 deaths
To 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.