| A | B |
|---|
| Crude Birth Rate | The total number of live births in a year for every 1,000 people alive in society. |
| Crude Death Rate | The total number of deaths in a year for every 1,000 people alive in society. |
| Agricultural Density | The ration of the numbers of farmers to the total amount of land suitable for agriculture. |
| Epidemiology | The branch of medical science concerned with the incidence, distribution, and control of diseases that are prevalent among a population and caused by things not generally present in affected locality. |
| Infant Mortality Rate | The total number of deaths in a year among people under one year of age for every 1,000 live births in society. |
| Physiological Density | The number of people per unit of area of arable land, which is land suitable for agriculture. |
| Natural Increase Rate | The percentage growth of a population in a year, computed as the crude birth rate minus the crude death rate. |
| Pandemic | A disease that occurs over a wide geographic area and affects a very high proportion of the population. |
| Pull Factor | A factor that induces people to move to a new location. |
| Push Factor | A factor that induces people to leave old residences. |
| Chain Migration | Migration of people to a specific location because relatives or members of the same nationality previously migrated there |
| Refugees | People who are forced to migrate from their home country and cannot return for fear of persecution because of their race, religion, nationality. |
| Unauthorized Immigrants | People who enter a country without proper documents to do so. |
| Circular Migration | The temporary movement of a migrant worker between home and host countries to seek employment. |
| Interregional Migration | Permanent movement from one region of a country to another. |
| Counter urbanization | Net migration from urban to rural areas in more developed countries. |
