1. Population Density Who?What?When?Where?Why?

2. Population Where is the world’s population distributed?

3. The Balance of Earth’s Surface Ecumene – The portion of the Earth’s surface that is occupied by human settlement. Ecumene – The portion of the Earth’s surface that is occupied by human settlement. –The areas of the Earth’s surface that humans consider too harsh to live, has diminished over time. What percentage of Earth’s surface is occupied by 75% of What percentage of Earth’s surface is occupied by 75% of human beings? human beings?

4. Sparsely Populated Regions Sparsely Populated Regions Dry Lands Dry Lands Wet Lands Wet Lands Cold Lands Cold Lands High Lands High Lands

5. Population Density Fig. 2-4: Arithmetic population density is the number of people per total land area. The highest densities are found in parts of Asia and Europe. Arithmetic “population” density is the number of people divided by total land area. The highest densities are found in parts of Asia and Europe.

6. Comparing Arithmetic Density Divide total number of people by total land mass USA – People=300 million Land Mass=9 million sq. kilometers or Land Mass=9 million sq. kilometers or 3 million miles 3 million miles India – People=1 billion Land Mass=3 million kilometers Land Mass=3 million kilometers Arithmetic Population Density USA - Approximately 33 persons per sq. kilometer or 100 persons per sq. mile India – Approximately 333 persons per sq. kilometer

7. Physiological Density A better way to measure population is to look at the number of people per usable area of land. A better way to measure population is to look at the number of people per usable area of land. –Arable Land – Land suited for agriculture. The more people that share an acre/hectare of land, the less food there is available. The more people that share an acre/hectare of land, the less food there is available. The US has a ratio of 156 people per kilometer, Egypt has 3,503. The US has a ratio of 156 people per kilometer, Egypt has 3,503.

8. Agricultural Density Agricultural density is the ratio of the number of farmers to the amount of arable land. Agricultural density is the ratio of the number of farmers to the amount of arable land. –USA – 4 per kilometer of arable land –Egypt – 1,401 per kilometer of arable land

9. Affect of Population Increase

10. Group Project Using the South American Map, pick a location to establish a new “Megacity.” Using the South American Map, pick a location to establish a new “Megacity.” Using the information that you have gathered in your notes to date, determine the best available location for your new city. Think about geographical factors when determining location site, and answer all questions thoroughly. Using the information that you have gathered in your notes to date, determine the best available location for your new city. Think about geographical factors when determining location site, and answer all questions thoroughly.