Rate of natural increase
- defined as how fast a population or number of people in a particular area grows naturally
- through births and deaths
- One of the factors that determines how fast a population grows or changes in size.
- Calculated by subtracting the death rate from the birth rate.
- Birth rate is defined as the number of live births per 1000 people per year and is expressed in terms of the number of births per 1000 people in a year (eg. 6 births per 1000 in 2009)
- Death rate is the number of deaths per 1000 people per year
- (eg. 3 deaths per 1000 in 2009)
hence, RNI: 6-3 =3 : increase of 3 people per 1000 in 2009
Birth rate > Death rate : RNI +ive and vice versa
Birth rate=death rate : RNI will be 0
Pop. distribution: manner in which people are spread over a particular area.
- Affected by the physical environment and the level of tech and is considered uneven.
- Fertile soil (river deltas)
- Suitable relief (not mountainous areas)
- Non-extreme climate (too harsh, cold ,dry like deserts)
- Rivers also act as a source of food and water and a life-line.
- favourable for growth of crops
- Technology allows people to overcome unfavourable environments and convert it into suitable living environments.
Eg. Las Vegas (water channelled from rivers to deserts)
Population density: Number of people living per square kilometere of land .
- Expressed in terms of number of people per sq kilometere. (people/sq km)
- Eqn: nos. of people/ total land area
Dense (high pop. density) (eg. cities)
- shortage of basic resources
- Enviro. pollution
Sparse (low pop. density) (eg. deserts, forests ,countrysides)
- Lack of labour