NATS 1840 Chapter 10: 10.1-Factors Affecting Human Population Size
8 Feb 2019
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Demography: the study of the size, composition, and distribution of human populations and the causes and consequences of changes in these characteristics. Population change: calculated by subtracting the number of people leaving a population (death, emigration), from the number entering it (birth, immigration), during a specified period of time. Popchange = (births + immigration) - (death + emigration) When (births + immigration) > (death + emigration) ; population increases. The world"s population is increasing, the rate of increase has slowed. = birth rate - death rate x 100. 4: brazil, pakistan, nigeria, bangladesh, russia, japan. Doubling time: the time (usually in years) it takes for a population to double in size. Rule of 70: take 70 and divide it by percentage growth to get doubling time (70/% =dt) Fertility: the number of births that occur to an individual woman or in a population.
