Chapter 5 Section 3Human Population Growth

Objectives:-Describe how the size of the human population has changed over time-Explain why population growth rates differ from country to country

AZ Science Standard: Analyze social factors that limit the growth of a human population

Historically, like the populations of many other living organisms, the size of human population tends to increase with time

Human Population

Agriculture

BeginsPlowing

And

Irrigation

Bubonic

Plague

Industrial

Revolution

Begins

Demography:

•The study of human populations

Demography Continued:

• Birthrates, death rates, and the age structure of a population help predict why some countries have high growth rates while other countries grow more slowly

Demographic Transition:

• Dramatic change in birth and death rates

Reasons for High Birth and Death Rates:

• Birth Rate is high as a result of:

• Lack of family planning • Need for workers in

agriculture • Religious beliefs • Children as economic

assets

• Death Rate is high because of:

• High levels of disease • Famine • Lack of clean water and

sanitation • Lack of health care • War • Competition• Lack of education

Males

Females

U.S. Population

Males

Females

Rwandan Population