I – Population density
Population distribution is the arrangement of the population on a certain area in accordance with conditions and requirements of the society.
Population distribution over a territory is described by the population density which is calculated by the rate between the numbers of people on an area to the total population. The unit of the population density is persons/km2.
a) The evolution of population distribution over time.
b) Population distribution is uneven
According to the statistics in 2005, the Earth has 6.477 million and the average population density is 48 persons/km2. However, population distribution is uneven, there are very populous region and also has a sparse population areas or even none resident.
3. The Factors affecting population distribution
Population distribution is a social phenomenon exist by the combined affection of series of factors. In addition, the factor helps to decide how the population distribute is the level of the labor force, the property of the economy then to the cause of natural conditions, history of the exploitation of that area, the migrations...
II – Types of colony
Colony is the specific expression of the population distribution over the Earth's surface, including the network of population exists on a certain territory.
2. Classification and characteristics
Due to effects of urbanization and industrialization, the rural populations today are a lot of changes on the function, structure and development. Apart from main activity is agriculture, rural populations also has other functions such as industry (mainly processing the agricultural products), industry, tourism ... In the result, the rate of those who do not do agriculture is increasing. The urbanization process also makes the architecture, rural planning becomes a kind of architecture, urban planning.
III - Urbanization
Urbanization is a process of economic and social which has a sign is a rapid increase in number and size of the urban population, the gathering of population in cities, especially large city also the spreading of urban lifestyle.
The urbanization process has three main features:
a) The trend of increasing urban population
b) Residents focus on large cities
Number of cities with a population over 1 million are now appear more and more. Nowaday, the world has more than 270 cities over 1 million people, 50 cities with a population exceeding 5 million.
c) The widespread of the Urban lifestyle
Along with the development of the urbanization process, urban lifestyle is widespread and affect the lifestyle of the rural population in many aspects.
3. Affections of urbanization to economic - social development and environmental
a) Positive effects
Urbanization not only contribute to accelerate economic growth, economic restructuring and labor structure but also make a change of the distribution of population and labor force, changing the process of birth, death and marriage in urban...
b) Negative impact
Urbanization, if not derived from industrialization, inappropriate weight to the process of industrialization, the influx of residents moving from rural to urban to rural areas would lose a large part of human resources. Meanwhile, job shortages, poverty in growing cities, living conditions increasingly shortages, environmental pollution which could lead to many negative phenomena in economic life - society.
Images : http://en.wikipedia.org/wiki/Population_density