Notes: Human Populations (pg. 10-11)

1. Notes: Human Populations (pg. 10-11) • How does the size of the human population change with time? • Increase • Why did the population grow slowly for most of human existence? • Life was harsh and there were many limiting factors such as disease. • Circle the letter of each reason why the human population began to grow more rapidly about 500 years ago. • A. improved sanitation and health care reduced the death rate • B. industry made life easier and safer • C. the world’s food supply became more reliable.

2. 4. Why can’t the human population keep growing exponentially forever? • Limited resources • 5. What is demography? • Study of human populations • 6. What factors help predict why the populations of some countries grow faster than others? • Birthrates, death rates, and age structure of a population. • 7. The hypothesis that explains why population growth has slowed dramatically in the US, Japan and much of Europe is called the… • Demographic transition

3. 8. Throughout much of human history, what have been the levels of birthrates and death rates in human societies? • High death rates and birthrates • 9. What factors lowers the death rate? • Improved sanitation, nutrition and medicine • 10. Is the following sentence true or false? Population growth depends, in part, on how many people of different ages make up a given population? • True

4. 11. Complete the following flowchart about the demographic transition. • Changes brought about by modernization lower the death rate  Births greatly exceed deaths, resulting in rapid population increase  as modernization continues, the birthrate decreases and population growth slows  the birthrate falls to meet the death rate, and population growth stops

5. 12. Circle the letter of each sentence that is true about human population growth. • B. the worldwide human population is still growing exponentially • C. most people live in countries that have not yet completed the demographic transition • D. the demographic transition has happened in the United States • 13. What do age-structure diagrams graph? • Number of people in different age groups within a population

6. 14. What do age structures of the US and Rwanda predict about the population growth of each country? • US is showing slow and stable growth while Rwanda’s population should double in 30 years.

7. 15. By 2050, the world’s population may reach how many people? • 9,078,850,714 • 16. What may cause the growth rate of the world population to level off or even slow down? • Countries growing exponentially will move toward demographic transition • 17. What do many ecologists suggest will happen if the growth in human populations does not slow down? • There will be serious damage to the environment and global economy.

8. Pg. 12 Human Population Review • 1. The human population size has increased over time. • 2. Birthrates, death rates and age structure population are factors that help predict population growth rates.

9. 3. Describe the birth and death rates of this population. • High birthrate and death rate. • 4. Has this population undergone the demographic transition? Explain. • No because they are still growing rapidly. (Many young people)

10. 5. The approximate human population of Earth in the year 2000 was: 500,000,000 6. Agriculture began in about: 8500 BC 7. The most rapid increase in population was caused by the: Industrial Revolution 8. In the past 5000 years, the event that temporarily halted population increase was: Bubonic Plague 9. The steepest climb in population occurred approximately between the years ______________ and the present. 1500 AD