Explain the four factors that produce changes in population size.
war
poverty
disease
drought
economic depression
Thank you Ms. Sue
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The four factors that produce changes in population size are birth rate, death rate, immigration, and emigration.
1. Birth rate: The birth rate refers to the number of live births in a population over a certain period of time. It is an important factor in population growth. To calculate the birth rate, you need to divide the number of live births during a specific period by the total population and multiply it by a constant (usually 1,000) to express the rate per 1,000 people.
2. Death rate: The death rate is the number of deaths in a population during a specific time period. It is a key factor that affects population decline. To calculate the death rate, you need to divide the number of deaths during a specific period by the total population and multiply it by a constant (usually 1,000) to express the rate per 1,000 people.
3. Immigration: Immigration occurs when individuals from other areas or countries move into a specific population. It contributes to population growth. To determine the impact of immigration on population size, you need to count the number of immigrants who move into a population during a specific period.
4. Emigration: Emigration refers to individuals leaving a specific population to move to other areas or countries. It can lead to population decline. To assess the impact of emigration on population size, you need to count the number of people who leave a population during a specific period.
By considering the birth rate, death rate, immigration, and emigration, you can determine whether a population is growing, declining, or stable over time. To calculate population growth or decline, you can use the formula: (birth rate + immigration rate) - (death rate + emigration rate). This formula takes into account the net effect of all four factors.