1. The Human Population Studying Human Population Chapter Nine Section One

2. Demography – study of populations Developed countries –Higher average income –Slower pop. growth –Diverse industrial economy –Strong social support systems: health care, family support, food services Developing countries –Lower average income –Simple and agricultural based economies –Rapid population growth

3. Exponential population growth

4. Age structure diagrams Distribution of ages in a specific population at a certain time Can be graphed as a population pyramid – a double sided bar graph

5. Population Pyramids

6. Survivorship Curves Survivorship – percentage of members of a group that are likely to survive to any given age Type I – wealthy developed countries, most people live to old age Type II – similar death rate at all ages Type III – many children die

7. Fertility Rates and Migration Fertility rate - # of babies born each year per 1000 women Migration – movement of individuals between areas Immigration – movement in (keeping population of developed nations from decreasing) Emigration - movement out

8. Fertility rates in the U. S.

9. Declining Death Rates Death rates declined more than birth rates because of clean water, adequate food, safe sewage disposal, vaccines Life expectancy – average number of years a person is expected to live –Most affected by infant mortality, the death rate of infants less than 1 year old