Birth Rate: Measure of an area's fertility. Number of live births per 1,000 people in 1 year.
Death Rate: Number of deaths per 1,000 people in 1 year.
Life Expectancy: Average number of years from birth that a person can expect to live.
Longevity: Increase in life expectancy over a period of time. A direct result of improved medical provision and increased economic development. People live longer creating an older population.
Natural Change: Change in size of a population caused by the interrelationship between birth and death rates. If birth rate exceeds death rate population increases. If death rate exceeds birth rate population declines.
Fertility: Number of live birth per 1,000 women aged 15-49 in 1 year. Also defined as the average number of children each woman in a population will have. If it's 2.1 or higher a population will replace itself.
Infant Mortality Rate: Number of deaths of children under the age of 1 year expressed per 1,000 live births per year.
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