| A | B |
|---|
| demography | scientific study of population characteristics |
| ecumene | poriton of the Earth's surface occupied by permanent human settlement |
| physiological density | number of people supported by a unit area of arable land |
| arithmetic density | total number of objects in an area |
| agricultural density | ratio of the number of farmers to the amount of arable land |
| Crude Birth Rate (CBR) | total # of live births a year per 1,000 people |
| Crude Death Rate (CDR) | total # of deaths a year per 1,000 people |
| Natural Increase Rate (NIR)(RNI) | percentage by which a population grows in a year |
| doubling time | the # of years needed to double the population |
| total fertility rate (TFR) | average # of children a women will have throughout her childbearing years |
| infant mortality rate (IMR) | annual number of deaths of infants under 1 year of age, compared with total live births |
| life expectancy | average number of years a newborn infant can expect to live at curent mortality levels |
| agricultural revolution | time when human beings first domesticated plants and animals |
| zero population growth (ZPG) | CBR declines to the point where it equals CDR and NIR approaches 0 |
| population pyramid | shows a country's population by age and gender groups on a bar graph |
| dependency ratio | number of people who are too young or too old to work |
| sex ratio | number of males per hundred females |
| epidemiology | branch of medical science concerned with the incidence, distribution, an control of diseases that are prevalent among a population at a special time |
| pandemic | disease that occurs over a wide area and affects a high portion of the population |
