Population

Population- total # of people in an area Population distribution- the way the population is spread out over an area

Population Demography- the science that tries to explain how populations change and why population distribution is uneven

Population Reasons why People move:  Live in a better place 

Population & History Where did most people live in the past? __________________________________

New Population Clusters After 1800 improved transportation and new ways of making a living changed things. Railroads & Steamships made it easier for people to move long distances New jobs in factories and offices meant that more people were living in cities

Population Density Population density- the avg. # of people per sq. mile Population Density varies from one area to another.

Reading Check Which has a higher population density, a city or an area in the country? ____________________________________

Population Growth Population growth depends on the birthrate and the death rate Birthrate- the # of live births each year per 1,000 people Death rate- the # of deaths each year per 1,000 people

Population Growth Thousands of years ago the world’s population grew slowly. Why?  Farmers worked w/o modern machinery  Many millions of people died of infectious diseases  Life expectancy was short

Reasons for Population Growth Today Birthrates have increased People live longer Why? Increase in world’s food supply Medicines to prevent diseases

Challenges of Population Growth Today Not enough water Not enough jobs Not enough schools Not enough resources