“Population Density is the number of people occupying an area of land.”
The total number of objects in an area. Population divided by Land Area Arithmetic Density The number of people supported by a unit area of arable land. Provided insights into the relationship between the size of a population and the availability of resources in a region. Physiological Density The ratio of the number of farmers to the amount of arable land. Agricultural Density
What inferences can you make by looking at countries with a high percentage of arable land but a low agricultural density? What inferences can you make about a country with a high physiological density but a low arithmetic density?
Part 2: Where has the World’s population increased?
“A population pyramid is a graphical illustration that shows the distribution of various age groups as well as the sex ratio, the number of males per hundred females and the dependency ratio, the number of people who are too old or too young to work.
“The demographic transition model explains the transition from high birth and death rates to low birth and death rates as a country develops from a pre-industrial to an industrialized economic system.
1.Though not official, some say that there is a Stage Five. 2.In stage five, CDR is greater than CBR largely because of an aging population. 3.The NIR is below Zero. 4. Much of Europe is entering this stage. Stage 5: Negative Growth
“The Epidemiologic Transition Model focuses on distinctive causes of death in each stage of the demographic transition.”
The stage of Pestilence and Famine Example: The Black Death Stage 1 The stage of receding Pandemics Example: Cholera Stage 2 The stage of degenerative and human-created diseases Examples: Cancer and Cardiovascular Disease Stage 3 The stage of delayed degenerative diseases Example: Cancer and disease is slowed or stopped by medical advances. Stage 4 Reemergence of infectious and parasitic diseases. Reasons: Evolution, Poverty, Improved Travel Stage 5 (Possible)