Population Concentration and Density Chapter 2 Sections 1 and 2

Key Concepts Overpopulation (intro) Population Cartogram (section 1) Population Density (section 2) –arithmetic density Arable Land (section 2) Physiological Density (section 2) Agricultural Density (section 2)

Population Overpopulation… –is a threat where an area’s population exceeds the capacity of the environment to support it at an acceptable standard of living –Depends on relationship between number of people and availability of resources A population cartogram shows a map according to population…not land size.

Population The four regions where most of the world’s human inhabitants are clustered –East Asia, South Asia, Southeast Asia and Europe Main reasons for uneven distribution of the world’s population –Dry lands –Cold lands –Mountainous lands –Lands that are too wet

World Population Animation

Population Density

Population - number of people occupying an area of land –Can be computed in many ways Each way allows geographers to understand population in comparison to available resources

Arithmetic Density Arithmetic Density (population density)- the total number of people divided by total land area –Pro: Easy to calculate and obtain information –Con: Cannot explain why people are distributed like they are

Physiological Density Arable land- land suitable for agriculture Physiological Density- the number of people in a region supported by a unit area of arable land –Ex. US = 172 per square km, Egypt = 2580 per square km –Higher physiological density = higher pressure that people place on the land to produce food

Agricultural Density Agricultural Density- the ratio of the amount of farmers to the amount of arable land –Ex. US 1 farmer per square km of arable land—Egypt 826 farmers per square km of arable land –Why is this? Why should the US have less farmers?

HIGH PHYSIOLOGICAL AND AGRICULTURAL DENSITY: EGYPT

Key Concepts Overpopulation (intro) Population Cartogram (section 1) Population Density (section 2) –arithmetic density Arable Land (section 2) Physiological Density (section 2) Agricultural Density (section 2)