main migration waves

On a national scale or place, the population can increase or diminish, besides for the natural movements, for the migratory movements, which are the human displacements of long duration of a place of origin to other one of destination. Inside the migratory movements we can distinguish two principal components depending on if the subject goes to a place or goes out of him. This way when the individual leaves his place of origin it is assessed as emigrant, whereas when it comes to the place of destination she is considered to be an immigrant. The third component exists inside the migrations, which one produces when individuals emigrated return spent a time to his place of origin, naming them returned

 

Synoptic chart of Spanish political system.

 

Spanish population pyramid

A population pyramid is a graph that representing the structure of the population into age groups and sex groups .

To make a population pyramid  need to know the number of its inhabitants, expressed in percentages.

population density

Population density (in agriculture standing stock and standing crop) is a measurement of population per unit area or unit volume. It is frequently applied to living organisms, and particularly to humans. It is a key geographic term.

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.

world population distribution

The world population is the total number of living humans on the planet Earth. As of today, it is estimated to be 6.975 billion by the United States Census Bureau. According to a separate estimate by the United Nations, it has already exceeded 7 billion. The world population has experienced continuous growth since the end of the Great Famine and Black Death in 1350, when it stood at around 370 million. The highest rates of growth increases above 1.8% per year were seen briefly during the 1950s, and for a longer period during the 1960s and 1970s. The growth rate peaked at 2.2% in 1963, and had declined to 1.1% by 2009. Annual births peaked at 173 million in the late 1990s, and are now expected to remain constant at their 2011 level of 134 million, while deaths number 56 million per year, and are expected to increase to 80 million per year by 2040.Current projections show a continued increase in population (but a steady decline in the population growth rate), with the global population expected to reach between 7.5 and 10.5 billion by 2050.

map of natural increase of world population

Nowadays there are 49 independent conditions in Europe.

 - You differ:

Depending on his length: the rule is the biggest of Russia and the smallest of Andorra

 Depending on his situation: almost they all have conference to the sea

 Depending on his form: Many are fragmented

 In agreement with his population: the most populated is Russia and the least populated is San Marino

 In agreement to his wealth: richer and more poor are the German and Moldavia.

map of countries of the european union

Currently there are 49 independent states in Europe. Some states today have their origin in the very recent changes that have occurred since 1989, after the fall of communism in Eastern Europe

Synoptic chart of the territorial organization of state

This scheme shows the different ways of governing

world water cycle

In the image it appreciates the hydrological cycle.
 With the evaporation of the water from the surface of the ocean. As it rises, the moistened air cools and the steam transforms in water: it is the condensation. The drops join and form a cloud. Then, they fall down for his own weight: it is the rainfall. If in the atmosphere it is very cold, the water falls down as snow or hail. If it is hotter, they will fall drops of rain. A part of the water that comes to the land will be taken advantage by the alive beings; other one will slip for the area up to coming to a river, a lake or the ocean. To this phenomenon he is known as run-off. Another little of the water will filter across the soil, forming caps of underground water.

world climatological map

 In the map there appear the different climates that appear in the whole world .

Physical and political map of europe