Fluctuation - The constant rising and falling of population, Birth rate - The number of babies born per 1,000 people per year, Death rate - The number of deaths per 1,000 people per year, Migration - The movement of people from one area to another, Natural increase - The birth rate exceeds the death rate and the population increases, Natural decrease - When the death rate exceeds the birth rate and the population decreases, Demographic transition/Population cycle model - The graph that shows the changes in birth rates and death rates of a country over time, Population density - The population per square kilometer, Population period - A visual aid to demonstrate the population structure of an area, Dependant population - Thepart of the population that cannot work and relies on others to provide them with goods, Fertility rate - The adverage number of children born per womanin the population of a reagon, Population explosion - A dramatic increase in the worlds population, Family planning - The use of contraception toplan when to have children and how many, Resources - A usefui material or product, Emigrate - To leave ones own country to permanently live in another, Celtic tiger - The time when forign investment rapidly grew the Irish economy,

Population and migration

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